To be honest, the wolf and dragon look the most effective, from a combat standpoint. Mantis just looks like he's going to attempt to "peck" the enemy with his hands, tiger looks like one good sweep from behind would take him down easily, and snake just looks awkward.
yeah, i suppose i should explain mantis and snake
neither of them are focused on straightforward damage. mantis is a style that was developed in order to counter other styles of kung fu, and revolves around waiting and countering your opponent. the point of using 2-3 fingers in your attacks goes along with the theme of waiting and being patient. you disable your opponent with long sweep like motions putting the force of your entire body behind said motion, and in that same motion strike the opponent in soft areas (eyes, groin, stomach). so, mantis is more about causing "smart" damage to your enemy in a way that looks cool.
The reason this style is so useful despite seeming so harmless comes down to the idea of qi, or, internal power (or something like that). Training yourself internally so that your movements have more power behind them brings more power to your strikes
Snake is somewhat similar. As it is based off of the behavior of snakes, it revolves around using fluid motions to hypnotize and confuse your opponent. You strike in odd places to throw them off, and you strike there relentlessly. When the opponent blocks off that opening you immediately find and strike the next opening. It's another style that looks really fluid and is fun to look at, but is a bit more relentless than mantis, and doesn't use the unique 2-3 finger striking style
THAT WAS A LOT OF WORDS, HAVE FUN READING IT ALL
e: thanks for the comments though guys!! i do kind of agree about tiger looking weird and off-balance taking a look at these all again
I'm definitely going to use wolf, but I'm still not sure on the second stance to use. I'll probably slightly redo the positioning of his arms in mantis stance because it doesn't really fit the character (and they only need to be slightly bent)
I'm thinking maybe mantis or snake for the second one though just because they're really unique styles imo and seems like they would be really fun to work with
e2: I'll have finished lineart (he'll have clothes!!! kind of) for these later today along with the fixed poses for the few that need it. That might help me decide haha