1. PCars is a racing sim. If you want racing, not just driving, PD isn't in the same conversation.
2. If PCars doesn't get wheel support, neither will PD so its a moot point. However, with PCars I at least have a PC option. The total cost of console + wheel vs a new, good quality PC is about the same and the PC is upgradable.
I also don't use a controller so its a non-issue.
3. I'm not under any illusions the game will look as good on PS4 as it does on PC. However, everything will be the same quality, unlike GT which will likely have both standard cars and tracks.
Gameplay first. I love Grid Autosport and it's graphics can't hold a candle to GT5. Gameplay.