You know, there's so little content for Harley being in a nice relationship of any kind ever (and even less for this particular pairing, which makes sense but also saddens me) that I don't really feel like being too picky here. XD I'd vaguely prefer cinematic!Harley just because B&HQ!Harley seems to be at least... partway to getting her crap together emotionally, whereas this one is very much not, buuut I also figure that would mean it'd be way harder to do much of anything with. And I can always write that myself later if I ever think of anything!

Tl;dr do what makes you happy, friend!