This is trickier than the usual Lin infinite.

Does ABC mode deal less hitstun than BCD mode?

As far as I know, no. COUNTER lasts longer and you can do supers, but ARMOR is safer I guess, but runs out so quickly.

I see. I vaguely remember trying another character's 2B dash loop (was it Joe? I forgot) and failed more often in Counter mode than in Armor mode. But it was ages ago so ...