Neither are better than the other. I grew up with my PS2, but today I prefer my Xbox 360. For me, it has a larger catalog of games and the controller feels more natural in my hand (The buttons on the PS3 controller are too far apart for my taste). Most fanboys argue that PS3 has better graphics, which is true in most cases, but if your like me who doesnt believe graphics makes a game im sure you will be satisfied with *the already amazing* graphics that are standard on Xbox/Ps3. (People also like to bring up the online memberships for both consoles. Xbox you have to pay something like $50 a year, while ps3 is free. I dont mind paying for xbox live though, its not that much per year and the service and features of the membership are well done).
If you ask for ones opinion on this topic, your going to attract fanboys who wont give you proper answers. The only way to get a proper answer is to find a friend(s) who has either/or both consoles and play them for yourself (hell, you could even just go to target/toys r us/best buy and play the demos. Most retail stores have systems set up for that).