Lol. I've said it multiple times but posts get lost here so quickly.
Chris is actually my favorite. He's the Superman/Captain America archetype, and I adore everything about him. That said, Jill is the tails to his heads on the same coin, and Chris has been the star of two straight MvC games where, unlike Jill, he was actually well-represented. Jill has closer ties to Nintendo, a classic moveset to draw from to keep a Smash character's roots closer to old RE than new RE, and she hasn't been relevant in the canonical RE timeline since 2009 when she was brainwashed by Wesker.
I vote for Jill because I miss her and because she's more likely with the rumored RE3make and fourth CGI movie both starring her, while Chris would likely get his new not-Roger-Craig-Smith VA and I'd die a little inside. Plus, in terms of making RE more popular in the Smash fandom, let's be honest: The fanbase likes girls.