I love God of War. From the hack-n-slash gameplay, to the ridiculous violence, to Kratos' screwed-up journey to godhood, this game had me hooked from the first glimpse of action. I hadn't even heard of it until my brother bought it (no internet at the time), and from there we destroyed this game. Practicing combos, slaughtering bosses... good times.
Dragon Quest VIII, however, might be my favorite RPG ever, and I'm a Final Fantasy guy. Weirdly enough, the game is amazing for its simplicity. Anyone can play this game, and I applaud it for that. Plus, there's fantastic and unique graphics, engaging characters and story, and damn, this game is long! I can't say much more. DQVIII wins.