They are all competitive with each other on the track. Here are the Pro/Cons of each (in my opinion)
SC10.2
Pros - Price, parts availability, setup help online, lots of people run them, simple design, lightweight
Cons - Fit and finish, fragile if you crash a lot, can't run mid with kit
TLR 22 SCT
Pros - Price, Parts availability (usually), setup help online, lots of people run them, tough, can run mid
Cons - heaviest of the three, somewhat complicated
Kyosho SCR
Pros - Best shock package, lightweight, setup help online, simple design, fit and finish
Cons - Hard to find kits, Parts availability (can be good in your area though), Not as many people run them, can't run mid
There are other pros and cons, but I think I covered most of the major concerns. If I were just starting out, I would lean toward the SC10.2. If you are seasoned and you want to run something different, the other brands are there. Others may disagree, but for a first truck I don't think you can go wrong with the SC10.2. Especially for stock classes. I would factor in parts availability as your primary concern.