Halo wars and Halo 3 can't really be compared, their two different genres. One's a real time strategy and the other's a first person shooter =/
If I had to choose I guess I would choose Halo 3 I'd rather be in the action then telling other people to do stuff for me. But they're still both kick ass.
wat lieutenant said it is completly preference whether you like FTS or RTS, comparing is hard 4 both genres. but i am into real time stradgedy, but Halo Wars is just low
halo wars was horrible. it was a complete waste of 60 bucks. i thought it would be cool but its just the same thing over and over again. im just happy they're making HALO ODST because its a first person shooter and its going to be awesome