Gran Turismo 4 on the PS2 was the pinnacle of the series, in my opinion. I dont understand how GT3 is heralded as the best when 4 is 3 but with way more content packed in.
I think Sport comes really close, but the lack of a meaty campaign that GT4 has makes it fall a bit short.
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.