Halo at its best is better than Gears at its best, but Gears currently feels like it's in a better place than Halo does. That said, I think Gears suffers from much more burnout overall compared to Halo. Halo, for as much as I'll knock the most recent 343 games has always felt different between games and allowed them each to have their own identity. Gears? Not so much.