Peach does outrange her in pretty much every way, though we have the....longer duration/laggier ariels, but we have several disjoints and very good KO power, edge guarding us wont be too hard, but if we do it from below and UpB its best to try and hit us from the side, or dont bother because it has so much priority and knockback.
You have the superior air speed, so thats great for you, and you can chain your ariels much better.
Because of how light you are, some of our general not reliable KO moves will become somewhat reliable
Uair, Utilt, Ftilt, etc.
You guys are tough to edge guard, but we at least would have a slightly easier time compared to most other characters, difficult, but possible.
Dair pressure is almost not gonna happen because you NEVER stay grounded long enough -.-
Both of us can space our moves quite well and it can be hard to punish either.
Overall I think its most likely
60:40
though
55:45
is definatly possible.
Not too hard for either.