How in the world is GT 5 better than Forza 4 ?
Braking, Weight Shift Physics, Angular momentum physics, Traction Physics, material skid variation, general car mechanics and tunings, surface variation ( gravel, tarmac, asphalt, ice, dirt tracks), track creation system - these are facts. Subjectively, I find it better because of the career development system, online community tools, car sale and purchase, tuning, special challenge modes (Mercedes SL 1955 on a Wet Rainy Nurburgring? Why yes please), rally tours, F1 tours, Hypothetical supercars (I mean driving the X1 is INSANE - have you seen it go? Nurburgring in 4 fkin minutes!), Kart racing, snow drifting, Nascars, realtime endurance races and my favorite reason: HID wheel support. We can plug in the G25 and so many variations of Logitech wheels, or Thrustmaster or whatever - everything goes.
Also 3d, 1080p, Head tracking, etc etc.