It makes sense if you judge according to game rather then categorizing according to publishers. some times EA, some times Mircosoft but some you find it's THQ or Rockstarts... It depends...
I prefer EA games are much better than Microsoft Games. The greatest serie that microsoft evere produced was Dungeon Siege.
Both are good at what they do. Microsoft produces better strategy games, while EA presents better sporting games like FIFA.
From those two, I choose EA Games. Their games are just so cool for me. I love the stunning graphics they offer.