cant really compare these games because one is a strategy game were you control armies and the other is a mmorpg. anyways i pick wow just because i think halo wars gets boring after a while.
I've played both, and I hate Halo and I have a severe dislike for WoW. But given the choice I'd take WoW hands down, because at least I can get a semi-decent gaming experience out of it.
Halo Wars is an RTS, and I think Halo Wars would be a better choice, because it won't destroy your life and ruin any chance you may have at having friends.
No way i can compare these games... They're both great... Been playing Wow for a while tho, getting kind of bored with it, but i havn't been bored with halo wars even once... And another thing that's good with Halo is that there is no monthly fee.