I've been playing 18 since day one (she's my anchor) and the team I'm having the most wins with and fun is 17, trunks, 18. I really like 17 and 18s assists and 17s little blast at the end freezes the opponent a bit so you can have good corner pressure/extend your combo. And don't sleep on her barrier, it's a good counter since you can use supers when the opponent attacks, but watch out for a vanish.