Zoro won't lose to Lucci, he'll beat him. Sanji just needs to stall, if he can do that, gets some acknowledgement then that's a W for him even if he gets overwhelmed (esepcially if he can inflict some damage or do somethinb impressive). I kinda doubt Sanji will get knocked out though, we'll probably just get Luffy's return. So I'll say neither though it's more likely to be Sanji.