The main complain for Forza over GT for me is the lack of good wheels support.
There are not many choices for Forza. MS wheel just doesn't cut it for a sim racer.
Fanatec has comparable high quality wheels coming out for the X360 but the price is too much for a person who already own a G25. And I don't understand the reason with the limited edition crap.
GT has a big selection of wheels and the wheels really take the driving experience to a different level.
You can get the decent DFGT for $100 or you can get the superior G25 for $200+ and there are many other choices.
Driving with a controller never felt like a sim.







