Both the Royal Enfield Classic 350 and Harley Davidson X440 are great bikes to use daily, however they have a different riding experience. The more powerful Harley is also slightly more eager in the corners and has a more engaging riding position, too. It will also be less fuel-efficient in city traffic owing to its larger engine. 

The relaxed Royal Enfield has a more laid-back riding position and will also feel like a slightly bigger bike. If you travel often with a pillion, the Classic is the better bet as both of you will be more comfortable. 

A test ride of both will help you decide which is best for you. 

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. 

Both the Harley Davidson X440 and the Royal Enfield Meteor 350 are similar in some ways, in that both use simple, air-cooled engines and aren't overly sporty. However, the bigger Harley has a clear performance advantage, which will be useful when you need to make an overtake at highway speeds.

Its 6-speed gearbox will also ensure that the engine stays smooth and relaxed at 100-110kph. It is something the smaller Royal Enfield bike won't be able to sustain so comfortably. 

If you are the sort of rider who rarely ventures over 80-90kph, then the more affordable Meteor 350 would be a good fit. 

Among the RE 350s, you can consider the Hunter / Bullet / Classic models for their comfortable ride, neutral ergonomics and smooth as well as characterful engine. In a similar vein, the Honda CB350s also warrant strong consideration for similar reasons. 

All the Harley-Davidson X440 models have a similar riding experience and only differ in terms of features and design, so pick the one you like the most. 

Lastly, we would also recommend you take a look at the Triumph Speed T4 and Triumph Speed 400 as they offer great performance and quality at a reasonable price. 

Take a test ride of all the bikes you shortlist before you decide. 

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.