i dont have any basketball games coz im not that much of a basketball fans..
but i can tell you which football game is better! yay! (but its my opinion)
i like madden better than 2k3...
the gameplay is much more developed
i dont have an Xbox but i have a ps2
i tried playing madden on xbox over at bestbuy and it doesnt have much difference with the one on my ps2 (except xbox has a better graphics)
for sports games.. i always prefer EA sports than sega
EA sports' games is more developed and detailed
but then again.. its just my opinion
its up to you really