Halo 3 Vs. CoD 4: Modern Warfare. Which is the better game?

Ah cod4 that game was amazing. That singleplayer mission all ghillied up was so damn good. Used to play that over and over again. I still remember that line of dialogue from macmillan when your about to reach the hotel. "50,000 people used to live here, now its a ghost town". Used to spend hours playing this game. Played it so much I must have made it to 7th or 8th prestige. Wanted to make it to 10th prestige legitly but I never did because I encountered some gay hacker in the lobby who made me 10th presitge pernamently ruining it for me.

Of course nowadays you would not catch me playing any of the new cods thats for sure.