Forza is only £10 now, so don't think you need to make a choice between the two, just get both.
Having played both, I much prefer Forza. Playing GRID right now and it's just an arcade racer where you fly around corners as if you're on rails, bashing your way to the front of the race. Forza is much more of a racer's game, and being 60fps as opposed to 30fps, it's much smoother.
Having played both, I much prefer Forza. Playing GRID right now and it's just an arcade racer where you fly around corners as if you're on rails, bashing your way to the front of the race. Forza is much more of a racer's game, and being 60fps as opposed to 30fps, it's much smoother.