Choose Denjin Hadouken (Super Art 3) because in 2I it has two stocks which not only allows for more denjin set ups than in NG or 3S, but it also means you have better ways to damage your opponent once you have them dizzy (For example, jumping fierce, crouching fierce, EX tatsu).
Denjin set ups:
EX hadouken xx denjin (on your opponent's wake up)
Crouching forward kick, EX hadouken xx denjin
EX blade kick, shoryuken (and then either xx denjin or (EX) hadouken xx denjin on wake up)