Uh, I only have the LC12b1 and nothing else

Its been a great car and I have never broken anything. I don't beat on it though. Its a lot of fun and has been every class of vehicle. Rally Car, Baja bug, SCT, Buggy, now it's a Truggy. The 1/12-1/14 scale is basically universal. It is built very well.
I don't know anything about the 1/10 stuff, but the PTG has always been a car I have wanted specifically for a Rally Car chassis. I mean, it IS advertised as a Rally Car with a Lancia Delta body. Killerbody RC makes that body, along with other bodies that are the same size.
This all applies of course to the reference of LC Racing stuff