The Triumph Speed 400 is a largely reliable machine with few sporadic cases of big failures reported in the 2.5 years. It has been on sale, so by and large, you won't need to visit the service centre very often. Additionally, its long 16,000km / 1 year service interval means that unless you ride a lot, you only need to service it once a year - after the first service, at least. 

However, if something should go wrong, not having an authorised service centre nearby will be troublesome. You should speak to the dealership if a mechanic will be willing to visit your residence to service it. Otherwise, you have to transport it to the authorised workshop every time something like this occurs. 

Ideally, we would recommend buying a machine that has a dealership and service presence in your hometown and close to your residence or office. 

The Harley-Davidson X440 is built by Hero and is a simple motorcycle without too many complex parts or features. As such, it should largely be a decently affordable machine to live with by and large. Resale value is very subjective and is sensitive to the area you reside in, as well as a multitude of other factors. 

If you want something similar, bikes like the Honda CB350 models, Royal Enfield Meteor 350 and Triumph Speed 400 make for promising alternatives.

Take a test ride before you decide to see which one fits you best. 

The Triumph Speed T4 will make for a better all-rounder because of its larger and more flexible 398cc engine. It is perfectly usable inside the city, and on the highway, you can cruise at early triple-digit speeds without breaking a sweat. 

If you want similar looks but more performance and better componentry, the Triumph Speed 400 makes a good case for itself. 

The Yamaha XSR155 is a much smaller - and lighter - bike that will have better handling and fuel economy, but will feel a little out of its element on the highway. 

You should also look at the Royal Enfield Bullet / Classic / Hunter 350 models (depending on your budget and design preferences). They are smooth, charming and comfortable machines that can be used both inside the city and on the highway. For similar reasons, the Honda CB350 trio also warrant serious consideration. 

A test ride of all of these, as well as anything else you're considering, will help you decide which one is the best fit for you.

Taking your considerations into account, bikes we would recommend taking a look at are the Triumph Speed 400 and Scrambler 400 X / XC. 

Both will offer you considerably higher performance than your Yezdi bike and will also be comfortable enough to handle daily commuting duties while being brisk enough on the highway as well. 

If you want an air-cooled, torquey engine, then you could even take a look at the Harley-Davidson X440, which is a comfortable neo-retro roadster that has decent performance. 

Take a test ride of the machines you shortlist before picking one. 

Bajaj has decided to downsize the 400cc Triumph and KTM models in India to ensure these bikes attract a lower 18 percent GST in comparison to the 40 percent tax attracted by machines over 350cc in accordance with the government's GST 2.0 regulation. 

The Speed 350 should be very similar in terms of its mechanics to the 400 - save for the smaller engine and slightly lower performance - and will most likely have a more competitive price as well. 

If you don't want to miss out on having a 40hp, 400cc bike, then you should buy the Speed 400 before it is replaced by a slightly smaller machine.  

Of the three bikes you're considering, the KTM 250 Duke will be the most engaging handler, but it has the least peak output and the smallest engine. This means you will have to rev it more to access the meat of the performance.

The Triumph Speed 400 is the most powerful bike of your shortlisted options. It will be a great city bike because of its effortless performance and plush suspension.

The TVS Apache RTX 300 is sure to be the most comfortable machine of the three. Its long-travel suspension and commanding ergonomics help, but it is also the tallest and heaviest bike on your list.

Take a test ride of all three to see which one fits your needs the best.

Some options you can consider are the TVS Apache RTR 310, KTM 390 Duke, Triumph Speed 400 and Royal Enfield Guerrilla 450. The Triumph and Royal Enfield aren't as overly sporty as the other two and will have a more effortless riding experience owing to their torque delivery, which is earlier in the rev band. 

The KTM 390 Duke is a proven product when it comes to sheer speed, but in its latest avatar has become quite compact, which may not be the best thing if you are a larger person. 

Last but not least, the TVS Apache RTR 310 has great handling and reasonable performance. We would recommend getting the variant with the quickshifter on the TVS as that offers the best value for your money. 

Take a test ride of everything you're considering before you decide.