Aawww, the forum's maturing! Very few biased posts; I'm proud of you guys.
Wii for Nintendo exclusives like Zelda, Mario, and Metroid. Also if the motion controlling is cool to you.
PS3 for ridiculously good graphics and power (No one really defines "power, when talking about these things. It's just automatically jammed in the "good" category because it sounds good), Blu Ray videos and a good overall entertainment system.