I'd say WiC if those are your definite choices. WiC has a lot of really neat dynamics to it. It's like the Battlefield of strategy games. Thing is in SP, though, you don't get to really pick your class. Regardless of that, it has a really touching story and I really enjoyed it. Without playing Multiplayer, though, there's no reason to keep playing it after beating the SP once.
If I were you, though, I would skip both of those and get the Company of Heroes Trilogy Pack on Steam.
[8:32:45 PM] Dusty Lens: Oh no, let me get that. Hello? Oh it's my grandma. She says to be roleplay.
[12:49:19 AM] Elgatodiablo: You know its nice that you have all that proof and all, Bacon... but I just don't believe you.