User blog comment:Gundam Legilis/Tifa vs Yang Pt. 1/@comment-11188061-20151006230533/@comment-5414218-20151007022525

They probably picked Tifa because she's well known and her fighting style is focused on martial arts so she can have a cool fist fight with Yang.

Wether those are good reasons or not I don't know. I think it's an ok choice I guess.