World in Conflict
without a doubt. CnC is great, too and you can load mods (which i have YET to figure out how to do in osx - stupid EA!) - which is weird because you can load mods in the mac version of Generals & Zero Hour.
IMHO, it really comes down to whether you like tanks, faeries, or whatever - Supreme Commander has it's detractors (the zoom is pretty awful - Sins of A Solar Empire does it much better, even if the game's balance broken slightly) and if you like fast paced action (RTS's, my fave) or slower, more in-depth type games (TBS's, which can be cool sometimes, i think, but i like blowin' stuff up!)😀, but so does every other game. i'm really looking forward to trying this Panzer game i saw the other day...
I've tried a LOT of RTS/TBS games, but always return to CnC Generals: Zero Hour and the awesome mods...