At its time GTR2 was more refined, with customed chamiponship, weather management, excellent FFB without any tweaking, excellent AI (still better or eaqual to the AI of most of the current sims) and great base content and great mods. I've never enjoyed rFactor that much, the FFB was awful, you had to tweak the realfeel settings (which with some mods just reversed the FFB effects or/and was making the wheel insanely strong before accelerating).