Leaving aside subjective stuff (games library, controller, etc. which are down to personal preference) there are three factual elements of 360 that are better than PS3 (I say this as a dual owner):
1 - The console is cheaper if you're not interested in Blu-Ray
2 - Xbox Live remains superior for overall online experience out side of the game - i.e. when playing its the same but the chat, etc. is more extensive and better integrated to the console
3 - it has USB ports in the rear of the console
Try to be reasonable... its easier than you think...