I used to be all team associated.. I raced in 4 different classes at my local hobby track and 3 of the cars were team associated. I owned and L3, TC3, and a T4. Of those 3 the L3 was the best and TC3 and T4 broke a great deal. Now at this time I was a beginner driver so evidently my skills were not the best..
I just completed my 3rd year of racing.. And I traded off my TC3 for an Xray 05. WOW. The entire season I went through 2 diffs and 1 c-cup. But I can say I only glazed the wall a few times.. But that is when I mostly broke the TC3 when I just glazed the wall (Break a front or rear A-arm).
My T4 well, it still breaks. I probably broke a half dozen A-arms this year.. The A-arms could certainly be beefed up on the off road stuff.
For TC. I would go with an Xray if you can afford it.. In the long run you will spend more time on the track racing then repairing.. Also not having to spend time and money at the hobby shop getting new parts.
I have heard though that the T2 owners are breaking more frequently then the FK05.
They say XRAY has had a hard time supplying parts.. But when you don't break you don't need them...