In the 350cc neo-retro bike space, our top picks are any of the Honda CB350 models and the Royal Enfield Bullet / Classic 350. The Hondas have a smooth, thumpy engine but have tall gearing which means you will need to change gears a little more often than on the Royal Enfields so you keep the engine in its optimum zone. Coming to the Royal Enfield bikes, we would steer you toward the Bullet / Classic more than the Meteor 350 because their ergonomics are more neutral, which will be conducive to spending long hours in the saddle. With its feet-forward position, the Meteor 350 will put a little more strain on your tailbone over long distances and road imperfections. Take a test ride of the bikes you're considering before you make your decision.