Jaime is one of those characters I could totally see in either team (TT or YJ). Since he already has his own solo, I'd be fine with either option or even none.
I guess I'd make him a Teen Titan because they'd need tech now Cyborg is no longer with them. Young Justice would already have that through Tim and Red Tornado. Of course, it looks like they're making the scarab magic powered, so that argument may be moot.