I would go more on condition than what mechanical parts it has. Those all have pretty much the same engine, just the way it turns the wheels is different. The 200es will have the most features of the 3, and was only made in 84 but they made a ton of them so lots of parts are available. The non ES with reverse must be a 200M, which would also have e-start. Nice trike. The regular 200 would be pull start and no reverse.
If you can post pics and prices of the 3 I would tell you which I would buy.
Rob