All three Royal Enfield 350s you have shortlisted are great bikes offering different riding experiences, so the one you should choose comes down to your preferences.
The Hunter 350 will be the lightest, most agile machine of the three bikes with the raspiest exhaust note. The Bullet 350 will feel like a relaxed roadster that can do just about anything as long as you’re not in a tearing hurry. The Meteor 350 will feel the most laid-back owing to its feet-forward riding position, typical of a cruiser.