Which is your favourite of the two and why? Its close for me, both have good multiplayer and Gears is set to improve a lot more with the release of Gears 2 this November. For single player I found the Gears campaign a lot more interesting and enjoyable than the campaign in any of the Halo series, however 4 player co-op on Halo 3 made things a lot more fun. If I had to choose my vote would go for the Gears series. What about you?