Ugh, I'm split for I have as much time invested in one as I do the other. Well I guess it really is no contest. Halo - by light years. Why? It had a continuing story that pulled you into it even though you were basically just a piece of military hardware from your beginning. Master Chief became way more than that to most people who ever played the games. It was engaging, exciting, entertaining, insightful, hilarious, and could imbue you with deep sadness. Then there was the multiplayer aspect that changed FPS online forever. CoD, the games originally were intriguing, but after MW2 the campaigns went off the rails for me. Once I got into the multiplayer, that is where the game excelled for me. Spec Ops were awesome to do solo or co-op too. But having a clan that had absolute map control for the 5-6 years I played them was unlike any other online game experience I have ever had. We were really good in Halo 3 BTB. We were near impeccable in CoD. That's why I'm split. Halo's stories and campaign replay ability never get old to me. The clan MM part was stuff of legend, and our Friday Night custom games were some of the best entertainment anyone could ever hope for. CoD, our clan dominance was just epic. Heck, even solo I could run the boards in the games I played. Sadly, I can not say the same about either past a certain point. Both have become something different than what they were, and I just abstain from all multiplayer, for it too much OP everything, all the time. I haven't played a CoD since Ghosts, and haven't played Halo MM since just a handful of games in 4. They're just too broken (monotonous, OP everything, chaotic) compared to what they were.