For PvE, it doesn't really matter which MA loadout you go for really.
For PvP, I'd go with Kung-Fu because of all the states you can get on your enemy, he may never even have a chance to roll. For duels, I would mix Kung-Fu and Karate, and for group PvP, you need max VD, but I would use Kung-Fu.
Karate probably does the most damage either that or kung fu Aikido is more balanced than both if you ask me though. I usualy do massive rolls/damage with my Kung-Fu karate loadout.