depends on the character.
Tager
Stance. 214D~B beats out everything of his and he's too slow to punish it.
Litchi / Jin
Back-dash. Would jump back air-dash j.6d but their AA options are pretty rape. My local Litchi likes to open with Itsuu.
Arakune
6D.
Everybody else
Either dash 2a/3c, j.9d or if i really feel like some ghetto stuff dash 214d~b. works better than it should ><;