TRF502X, DEX410, or B44.1?

[nosliw]

Hello guys,

I need help to pick a new car. Gonna run this car on a outdoor dirt track, hard-packed, bumpy, and sometime gets really dusty. All of these cars have parts support in my area. So far, I'm a bit biased to B44.1 but it seems the most fragile out of this three cars.

So, which car do you guys think should I pick?

Thanks