Nefarious B
Smash Champion
Uair is 4 frames. That might not be fast enough to get in between dairs at 10 frames by including the SH if the peach is sitting on top of us spamming them. However, you can do jump canceled usmash OOS if they're staying above you spamming and that's 8 frames.
If the peach hits your shield then retreats away you have more options, as uair fair bair or nair can all hit her at that height, and all of those will beat peach dair either by spacing around it or in the case of uair, just flat out beating it (this spacing is really impractical though, it's very easy to mess up)
If the peach hits your shield then retreats away you have more options, as uair fair bair or nair can all hit her at that height, and all of those will beat peach dair either by spacing around it or in the case of uair, just flat out beating it (this spacing is really impractical though, it's very easy to mess up)