I love CoD, it is definitely so much better than Gears (which is why I have a Ps3) it has a great online system introduced in CoD 4 and is just a better game over all
Both have their own styles, where COD focuses on reality and is really good with their accuracy to weapons and battles (to a limit) and Gears is great with its extent of creativity. I prefer to play Gears, but I also like COD too, it just depends what my friends are doing.