Tempest MB Spin, no doubt about it.
7 frames, allowing him to punish all those tricky -7 and -8 moves in MKX.
Best AA in the game, punishes all jump ins and crossovers.
Leads to combo damage and ultimately, momentum.
Extends combos.
Armoured, meaning it can blow through gaps.
Can be used a viable wake up.
Has deceiving range.
Requires a character specific punish when blocked.
No contest.
6 frames, allowing her to punish all those pesky -6 -7 move in MKX.
A very good AA, punishes a lot of jump ins and crossovers.
Leads to combo damage and (depending on variation) 50/50s or hard to blockable missle set ups.
Armoured, meaning it can blow through gaps.
Can be used as a viable wake up.
Has shitty range.
Safe, unless in corner.
Aren't all punishes character specific punishes? That didn't make sense to me.
Sounds like there is a contest.
The icing on the cake, she gets it in all three variations.