The first time you got a pass for this thread:
Now you're at it again???!!! Dumbass thread #2 already...
The questions you're asking are very basic and do not warrant their own threads for discussion. All the info is easily searchable and we also have the small questions thread for little dumb things like this thread.
I'll be nice ONE more time, but this is the last one.
All S-chasis are pretty equally suited for drifting/roadrace/autocross. The S13's are a little lighter and feel more nimble. The S14's have improved rear suspension geometry and a little more rear grip on-throttle, but they're a little heavier and just don't feel quite as nimble. Pick whichever one suits your fancy, it doesn't matter.
Well except convertibles and fastbacks with sunroofs. Those give you aids and are for the peasants and tasteless...