for the follwing grooves, in my opinion the best snk teams are as follow:
c-groove: Yama, Kim, Rugal.
a-groove: Geese, Hibiki, Todo.
p-groove: Kyo, Geese, Yama.
s-groove: yama is the only one i can think of.
n-groove: iori, geese and yama.
k-groove: lots of snk characters.