This is probably the toughest one I've commented on yet. But I'd go....
1. Hilary Duff - Screams tough, even though she's the shortest of the group. Seems like she'd be a bruiser and would take any girl on this list to task.
2. Ashley Benson - Also has that sorta tough vibe that Duff gives out, I think she'd be the one to give Hilary the best fight of the group. She definitely seems like she'd be the instigator and would probably finish the fight on top of most women as well.
3. Madelaine Petsch - Never seen Riverdale but something about her gives off a sadistic vibe. Like she'd definitely fight dirty and do whatever it takes to win. I think that sort of underhandedness puts her above No.4, but only by an inch.
4. Katherine McNamara - I don't know too much about her either, but she seems like she could hold her own. Maybe I'm totally off and she's too much of a pretty girl, but I think she'd be a solid fighter.
5. Mila Kunis - I hate putting Mila this low. I think she'd be the best strategist of the group, but I think she's just too lithe and slender whereas girls like McNamara and Petsch seem to have a bit more definition. Don't think she'd be a bad fighter whatsoever but she lands No. 5 for me here.
6. Emma Stone - This was the easiest choice. I've never seen Stone as being a credible threat to most celebs, and that is certainly the case for this list as well. She'd take a top 3 position on a list with, Lilly Collins, Alexis Bledel and Ariana Grande. But against the competition here, I don't think she stands a chance. I just think she'd crumble under the first signs of pressure.