They're pretty much the same on paper.
Forza has mainly sports cars and Le Mans. GT has sports cars and Le Mans and Japanese GT and Rally and Formula 1 and ooooooold cars (as far back as the 1800's) and now NASCAR. It's much more comprehensive.
I prefer the way the driving in GT feels. In Forza, I might just be playing it wrong, but I feel like I'm drifting through every corner unintentionally. GT has better tracks, inarguably.
Forza has a lot of exterior customisation, but personally, I don't think that shit belongs in a racing sim.








