I second the 200!
If I were you I'd get a ride on both 250s and also find a 200. Just a 2 min spin around a car park will let you know which one feels nicest. That's the one to buy.
All trials bikes have "issues" compared to MX bikes as they are just not as well finished/tested before release for some weird reason. Good maintenance resolves 99% of issues though and the remaining 1% is all common fixes which everyone has so no big drama. These can range from stator on the beta (cheap to fix for good) or a gear box on the Gassers (not cheap to fix). I can't comment on the Sherca's er sorry Shercos as I've not owned one but they look nice and from what I have seen are good at finding traction. This might be handy when you need to go back and pick up the bits that have fallen off (joking).
Buy the best condition best feeling model you can. I went from 520 KTMs, 450 MX and an XR 600 to a GG300 Raga. It was an animal that I was glad to see the back of (inside actually as the gear box exploded on me and trashed the cases when the shift drum split). I then rode a 200 beta rev 3, paid for it and have never looked back. It flatters the rider without punishing mistakes.