We are talking about graphics not popularity LOL... Xbox is MUCH more powerful then ps2. PS2 wont improve much graphically anymore..while the xbox is just hitting its prime. Xbox has so much more graphic power..bump mapping,normal mapping,pixel shaders,True DD sound,more ram,hd,much better graphic chip,faster cpu (twice as fast),etc..the list goes on Let alone xbox's online gaming servers just flat out own ps2's online gaming servers...HANDS DOWN!
Here's one example of racing games on ps2 and xbox.
PS2 Gran Turismo 4 will sport 4000 poly's per car - 4th gen ps2 game
Xbox Project Gothem 2 sports 16,000 poly's per car - 3rd gen xbox game
You do the math
I own both systems and a ton of games on both..xbox is far better graphically