i really have no idea what would happen here if rogue touched a symbiote... i don't think EITHER would enjoy it. she'd be flooded with alien memories, and her touch always effs her victim up. venom would likely recover first and kill her... maybe.
if she doesn't touch him, it's a tough call. she's likely stronger but i think i'd give him the edge physically over all. not sure he could choke her out or use any of his usual forum tactics though as that would involve having to touch her i'd think.
huh. this is a toughy. /shrug