If they're booked like they were in Japan, Shida is the stiffer striker and is the more technically sound grappler - fwiw in pro wrestling anyway.
Pre-NXT, Ace of Stardom-era Io Shirai is kinda silly in terms of damage soak.
Like, she got up after this and continued wrestling Mayu for another ten minutes.
This sort of portrayal also carried over to her appearance on Lucha Underground.
Unfortunately being a bloody casual, I don't know too much about Shida's AEW run, though she used to put on some bangers against Kana (Asuka), including an intergender tag match against her and Kenny Omega.