If you want to stay within the Royal Enfield fold, you can look at the Hunter 350, which will feel much more manageable and comfortable than your older Bullet. But if you want to get a new version of your bike, the base Battalion Black and Military variants of the Bullet 350 will fit in your budget.

The latest Bullet is a refined, comfortable and reliable machine which should return decent fuel economy, when ridden sensibly. Do bear in mind that with the Hunter, you will get dual-channel ABS. But the Bullet's base models only come with single-channel ABS and a rear drum brake. 

Alternatively, other options from reputed brands worth considering are the TVS Ronin, Apache RTR 200 4V, Honda CB300F, and Bajaj Pulsar N250. These smaller bikes will offer similar performance to the RE 350s - if not more - while being more fuel efficient too. 

Take a test ride of these machines before you make a decision. 

Considering your stature, in the Yamaha stable, instead of the MT-15, we'd recommend looking at the new XSR155. While both are mechanically near-identical, the XSR is a more spacious machine than the MT. Since this will be your first bike, the XSR will prove to be the most manageable and approachable. Thanks to its lighter weight and unintimidating power output. 

The Bajaj Pulsar N160 you're considering is a good option, but it will be the slowest of all the bikes you've shortlisted. However, if all you're going to do is potter around town, then getting the Pulsar makes sense as it is the most city-friendly bike here. 

Coming to the two Pulsar NS models, the NS200 will feel quite sporty and engaging while still being friendly enough for city use. However, the bigger NS400Z isn't the most city-friendly machine. Also, it will return lower fuel economy owing to its larger engine. 

The Honda CB350 models are very different to ride, thanks to their neo-retro leanings. It will be the most comfortable and relaxed machine of all the bikes you're considering. Lastly, the TVS Apache RTR 310 is actually quite a capable do-it-all machine, and will give you room to grow as a rider, too. 

Since you are considering multiple bikes with different riding styles and at very different price points, we'd recommend you first decide on your budget.  After that, choose within that range accordingly. Also, take a thorough test ride of everything you shortlist. 

Since you already own a 150cc bike, it would make sense for you to stay in this same category. Of the options you have shortlisted, the Honda SP160 and Bajaj Pulsar N160 are the ones we'd recommend you go with. Both are smooth, comfortable, stylish and reliable bikes that will give you the fuel economy you desire when ridden sensibly. Another great option in this class you should take a look at is the TVS Apache RTR 160 4V. 

Make sure you take a test ride of these bikes to see which one suits you best. 

Since you have a long daily run, getting an electric scooter would be advisable, as in the long-term, you'll save a good chunk of money in running expenses. In the EV space, you should look at models with a 3.5kWh battery or higher, considering your daily 60km run. Options we'd recommend taking a look at are the Ather Rizta, Bajaj Chetak and TVS iQube as they come from reputed makes with a good reputation for reliability. 

While the Ather 450X is a fun scooter to ride, it's quite cramped and has stiff suspension, which won't be ideal for your long daily commute. Simple Energy has a very small dealer network across India, and the Ultra e-scooter is yet to prove itself in the market. So we'd advise sticking to more mainstream brands. 

Since you are a taller person, we would recommend you look at the Yamaha XSR155 instead of the MT-15 as the XSR is a more spacious machine which will be useful to you. For a similar price, you will also get larger machines like the Bajaj Pulsar N250, TVS Apache RTR 200 4V and Honda CB300F. It will offer you better performance at the expense of a small hit as far as fuel efficiency is concerned. 

Since you have mentioned that you are considering the Honda CB350 models. Do bear in mind that these are relaxed neo-retro roadsters which will offer you a more laidback riding experience and good comfort levels. Although fuel economy will be quite a bit lower than that of the smaller bikes we have mentioned above. It is also worth taking a look at the Royal Enfield Hunter 350 because it offers a similar experience to the CB350 but at a lower price and has comparable fuel economy and performance, too. 

A test ride of every bike you shortlist will help you make a decision. 

In the ICE scooter space, among the practical, family-centric offerings, consider the TVS Jupiter 110/125 and the Suzuki Access. Both have some of the best ride qualities on an Indian scooter and are quite fuel-efficient, spacious, and practical. If you want something quicker, then the TVS Ntorq 125 / 150 models are worth taking a look at because they blend peppy performance and everyday usability quite well. 

Since you have a pretty long commute, in the EV space, you should look at options like the Ather Rizta 3.7, Bajaj Chetak 35 models and TVS iQube 3.5 variants so you have enough range to tackle other things outside of your daily run. These EVs will be quite a bit more expensive to buy than the petrol-powered scooters listed above, but you will recoup the additional money with the low running costs. 

We'd recommend a test ride of these machines over all sorts of roads so you can decide for yourself which is the best option for you. 

Since you have a long commute and you want a sporty-looking bike, the options you should be looking at are the TVS Apache RTR 200 4V, Bajaj Pulsar N250 and Honda CB300F. These are machines that will return respectable fuel economy, have enough performance and comfort to tackle your long daily commutes and also be reliable in the long run. 

However, since you have mentioned that your route has a lot of bad sections, we would strongly recommend you take a look at the Hero Xpulse 210. With its upright ergonomics, long-travel suspension and smooth, tractable engine, this will be the most accomplished bike to handle your daily runs. 

Take a test ride of these bikes to see which one suits you best.

Since you already have a Unicorn, you could stick with Honda and get either a new Unicorn or its more stylish sibling, the SP160. Both are mechanically very similar, with the differences boiling down to features, seating ergonomics and a small price difference. These will return good fuel economy and also be reliable in the long run. It is an important thing to consider since your last bike is 17 years old. 

If you want to look elsewhere, bikes like the Bajaj Pulsar N160, TVS Apache RTR 160 4V and Yamaha FZ models are worth considering. Of these three, the FZ has the best fuel economy but is the least engaging to ride. The Pulsar and Apache have slightly lower fuel efficiency but offer you more comfort, power and features. 

A test ride should help you decide which is the right bike for you. 

Considering your requirements, the options we would recommend you take a look at are the Bajaj Pulsar N250, TVS Apache RTR 200 4V, TVS Ronin, Honda CB350 and Royal Enfield Hunter 350. Of these, the lighter 200s and 250s will feel more agile and have better fuel economy, while the heavier 350s won't feel as agile but will be a little more comfortable. 

Another option worth taking a look at is the Hero Xpulse 210, which will be the most comfortable of all the bikes listed here. However, it won't be as agile owing to its large 21-inch front wheel, soft long-travel suspension and long wheelbase. 

There are also some instances of engine issues being reported online, so it would be advisable to wait for some time before purchasing the Xpulse.

A test ride of these bikes should help you figure out which is the best option for you.