Choose Hayate.(this is mainly a joke, but seriously he's just better in every way including whiff punishment)
Spacing is the key. 2p is +1, 1p is a good tracking low punch which crushes highs. Punch throw is really good with Ein as well. Try to use PK alot in neutral to bait out a reaction. 236k is also +1. be sure to check out my Ein thread for more stuff.