I'll start by stating that i own CoH but never tried it online, and that I have only played the WiC demo (it's due out sept 18).
Ok, what do you want more? Single player or multiplayer?
-WiC is more of a BF style online RTS (read my post on WiC).
-CoH is superior in single player from what i have seen on the first mission on the WiC demo, and i'm not much of a fan of base building RTSs online.
I would say they are both equal out of their element (WiC in single, CoH in multi), its' a matter of what you want more. The demo (1.2 gigs) for WiC will let you experence what it's like single and multiplayer (free multiplayer map), i would assume CoH has something similar.
I would advise trying both demos. And perhaps someone who knows CoH online can comment on it. You can also view game footage on youtube.com