I chose the PS3 XMB because it is simplistic. When I want to do a task, like play a game, or listen to music, it's right there on the bar. Also it's the same as PSP, and those consoles work well together. Yes I realize the PS3 dashboard is full of limitations right now.
360 Blades are good and all, but they're full of advertisements. It's like my Verizon phone.