>>534233213
to expand upon it
the base ATT on alice's engine is a little better, but piper's engine makes up for it in higher %s.
i'm not quite sure if AM 60 is faster than buildup 40%, i wouldn't think it is. but it does have the advantage of more buildup while NOT spinning. but to be fair, you'll be bringing lucy, yuzuha or whoever to take up some field time while EXing anyway, so my point is i doubt it's a huge dps loss.
finally the 40% phy DMG vs 64 AP. i again don't know which is meant to be better during a spin, outside again alice's is better. but if you're bringing vivian, who wants you to have high AP, then piper's one is better.

personally, i play the shit out of piper, and won't be rolling it.