What do you run? 5 or 6 cells? wich motor and what traction conditions?
I consider both excellent cars, both best for low grip and/or rubber tires. (t2r even more than the shumi).
The t2r is likelly to need outdrives upgrade if run with hot motors. Despite the outdrive thing, i consider the xray less likely to break.
Also, for 5 cell/1350 grm limit the xray is a litle on the heavy side.
Anyway, if you have parts and support for both, u really cant go wrong with either