RF2 is ffb/physics wise the best, ex aequo with Assetto Corsa(better graphics than RF2, FFB 98% of RF2 imho, many mods available )
iRacing is king in online racing. And that's about it.
Nice graphics but feel/tyre model/ffb is not realistic enough also stated by real life(Indycar) drivers. And they will never get it right I'm afraid.
RF2 had the Official Le Mans 24H online premiere a few months ago.
That should say enough.
M2CS Cup Racer(450PS) is great in RF2 as is Sebring, Brands, New '20 Zandvoort, thePorsche Carrera Supercup(difficult car without ABS and TC and not much downforce) and McLaren Senna, LMP2 cars (and a lot more)
M2CS is pretty well driftable:
But I still play Assetto Corsa. Having Content Manager, SOL and the CSP it's still awesome after >6 years.
Cheers
Robin