I have both, the PS3 is hooked up in the living room for media streaming purposes, and the xbox 360 is in my bedroom used for the same purpose. The living room is 52" and the bedroom is 42" I agree, the TVersity on the PS3 seems more buggy and doesnt perform aswell, I have no idea why, tweaked a zillion settings. The regular streaming performs far better on the PS3 than the TVersity, but I agree regardless if its TVersity or the regular streaming function, I think the quality on the xbox 360 is better, its far quicker and more responsive. Both are connected via WiFi and both on HDMI. I tried switching the systems around, and its the same story, so I dnt think its the Tvs. Both are Sony Bravias. Beats me why theres a difference?
On another note, why would anyone be crazy enough to invest in an Apple TV?