I actually own both. I own a 30g 1st gen Fatty that crashed and is in the process of being fixed but I currently play on my Slim 120g. Out of the two I would definately say the 1st gen Fatty is my favorite/the best. The option to be able to play PS and PS2 games was great. When I do get it fixed I was going to look into swapping the HDDs between the two so I can begin to use my Fatty once more.