-On the sim side:
Assetto Corsa: it's the absolute king and hell yes it's a game changer compared to anything else. Game itself is badly polished, but it feels so good on the wheel that it makes the game instantly the first choice if you have a force feedback wheel. It needs almost 0 adjustments.
Assetto Corsa Competizione: feels very similar to the first one and it's a much better game in everything. Let see how they port it to consoles.
Sebastien Loeb Rally EVO: My favorite rally sim of the 4 or 5 (counting WRC and Dirt sagas) we have this gen. It doesn't need almost any configuration and it feels flawless. Gaming part of it is very good. Suffers from fps (30 fps!) and polish (Milestone

) . The best part of it is the tarmac physics, IMO, the closest to Assetto on consoles and just so superior to DR2.0.
Dirt Rally 2.0: overall, the best rally sim on consoles. Force feedback needs some adjustments, but it feels rather good once you get it. Better than DR1 in almost everything.
Project Cars 2: feels very good, but it needs a lot of work configuring it (not just force feedback). If you are up to it, might really worth it as the game has some interesting stuff, like the ridiculous amount of tracks (best game in this aspect). Don't even bother with the first one, 2 is exactly the same but much much better in everything.
WRC: 5, 6, 7 and 8 have been developed by the same people, and they aparently got better with each one. They have the best stages IMO and all the goodness of the official license. Didn't tried 8, but 7 wasn't bad on the wheel and physics were decent. Needs a bit of work to get the force feedback right. But like I said, I haven't tried 8.
-On the arcade side:
The Crew: best arcade on the wheel (you have to activate the sim option or something like that). It's ridiculous that an arcade has such good force feedback with 0 adjustments, it can even look with pride to the sim realm. And the game is really good. Don't ask me why, but the second game feels like **** on the wheel. Ubisoft
Gravel: it's Sebastien Loeb Rally evo with arcade physics. No more no less. Game is different, but I really like it.
Driveclub: feels decent and I don't have to talk much about a jewel like DC, but I'm not sure if you should buy a game with shut down servers that you can't even find on the ps store.
Grid: tried it a bit with wheel and I was surprised. It's not bad, but the game is not the best thing in the world (IMO worse than Autosport) and physics are really simple.
I honestly think that the Crew is the only arcade that worths it to play with wheel (it's just fantastic). Driveclub is dead and it's on the pad when it really shines. Gravel and Vrally have both sim brothers (Sebastien Loeb and WRC). Why would you play Grid with wheel if you have similar type of games with sim physics like Assetto or PC2? And I don't even have to explain why NFS should not be mentioned. Haven't played Wreckfest. Neither Vrally or Baja on the wheel.
My priority list if you have wheel: Assetto Corsa Competizione > Assetto Corsa > Sebastien Loeb > DR2.0 > The Crew > Project Cars 2.
Can't talk of WRC 8 and wouldn't be wise to recommend 7 when 8 is supposedly better.
PD: Feel free to ask