Both bikes you have considered are good for a beginner rider. The Honda CB350 H'ness will feel like a more spacious and larger machine than the Hunter, which will be a good thing if you are a larger rider. 

On the flip side, with its smaller size and 17-inch wheels, the Royal Enfield Hunter 350 will feel more agile and flickable in city traffic. Do bear in mind that coming from an Activa, both these bikes will feel quite heavy, weighing 181kg.

Something that will be similar to a ride but substantially lighter will be the TVS Ronin, which weighs 160kg. We recommend you take a look at the Ronin instead of the two 350s. Even though you are familiar with how to operate a clutch and change gears in a car, on a motorcycle, it is a different ballgame. 

Do take a test ride of the machines you shortlist before you decide. 

Both bikes that you have shortlisted will be excellent companions for your long daily run. Both the Honda CB350 and Royal Enfield Hunter 350 have smooth, torquey engines, upright seating ergonomics and a plush suspension setup. If you are a taller person, you may feel a little more comfortable on the CB350 because it is a larger machine than the Hunter, although the RE isn't exactly cramped. 

In a similar price range, you should also take a look at the Hero Xpulse 210. With its long-travel suspension, peppy engine and commanding ergonomics, this could possibly be the most comfortable bike to tackle long distances every day. Its seat height - at 830mm - is on the taller side, but if that's not a dealbreaker, we'd strongly recommend taking a look at it. 

A test ride of these three will help you decide which is the best option for you. 

Since you have had such a good experience with TVS, you could stay within the company's fold and step up to something like an Ntorq 125 / 150. The Ntorq models pack in more performance - especially the 150. But it doesn't come at the expense of comfort or practicality, and they can easily be used on a day-to-day basis. 

However, if you want to stick to a family scooter, then you should look at options like the TVS Jupiter 125, Suzuki Access and the Honda Activa 125. Of the three, the Jupiter is the only one with the huge 33-litre underseat storage area - an unmatched USP - as well as 12-inch wheels at both ends, which will give you a more stable ride over rough roads. 

A test ride should help you decide which scooter is best for you. 

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. 

Between the Royal Enfield Classic 350 and Meteor 350, the former would be our recommendation. The Meteor's feet forward position will transmit more jolts to your back over bad patches of road. Therefore, it won't be comfortable over long stints in the saddle. The Classic's upright and neutral rider's triangle will be easier to live with on a day-to-day basis. 

You should also take a good look at the Honda CB350 models because they have a similar riding experience to the RE 350s. But are much lighter and come with alloy wheels and tubeless tyres. They also have a slip/assist clutch, resulting in little effort when operating the clutch. 

Since you are a taller person, looking at an ADV like the Hero Xpulse 210 and TVS Apache RTX 300 is also a good idea. Of the two, the RTX is the better all-rounder, but the Xpulse is lighter.

Take a test ride of these bikes so you can decide which is a better fit for you. 

Since you are dissatisfied with TVS' aftersales experience, we would recommend you take a look at scooters from Japanese brands. 

Options like the Suzuki Access, Honda Activa 110 / 125 and Yamaha RayZR / Fascino Hybrid models have cemented their reputation for reliability, easy spare parts availability (especially so for the Activa and Access) and low running costs. 

These scooters are also comfortable, practical and quite fuel efficient, so picking between them will boil down to which one you prefer personally. A test ride of all these should help you make a decision.