Well honestly... I'm a huge GT5 fanboy... but I love Forza meshes, as we are using them. GT5 meshes are more advanced, and much more time was spent on them, blah blah and these fanboys generally discuss realism and you can see that GT5 is superior in graphic department... newer hardware, blah blah... enough! This is not the place for discussing that. In the end, they are BOTH DIFFERENT GAMES, and each one has its pros and cons
Back on topic:
What I can say is that SLRR is really honest being such an old game engine