I have seen countless debates about which racing franchise is better in terms of graphics and realism and at times I have also seen Forza fans actually trying to convince others that it is better than GT (which in my mind is just plane blasphemy).
Since getting GT 5 Pro, I have done countless comparisons of the two and Forza is not even 50% as good as GT 5 in any of the categories I have outlined above.
Here are a couple of video comparisons (although admittedly may be a bit biased) but it is helps to show that GT is more than a game but also a simulation that is out of the league of all the other games.
http://www.youtube.com/watch?v=p_NaGxgjd3M
http://www.youtube.com/watch?v=6UMyB...eature=related