You won't be setting any speed-records on a TW at your or any other weight so that shouldn't bother you if you've done your homework.
I have ridden an XT250 but never owned one. It's a great bike and I had a time deciding between the 2 myself. A different, stiffer ride probably more attuned to off-road than a TW IMO. It physically felt smaller than the TW to me at 230lbs.
Anything to know?
They are great fun.