A little bit off-topic (not that much though, just helping the OP a bit more deciding which simulation to get), I just tried
Automobilista.
It's really a GREAT game, but I didn't "feel" the car as much as in rFactor 2.
Definitely, physics felt more real in rFactor 2.
A.I. didn't seem that much better than rFactor 1. A.I. in rFactor 2 did seem "human" to me... Scary. lol
Didn't try the multiplayer.
Also, I really don't think the graphics improved that much compared to rFactor 1.
(then again, I'm spoiled by AC and everything looks lifeless after you've been used to its graphics lol)
I'm not even sure they're better than rFactor 2, unlike what people say.
If you download the "right" tracks and cars for rFactor 1, and use a filter or something like GEMFX, it looks the same or even better. Same for GTR2.
Not bashing the game though! It IS great!
I definitely enjoy their cars and I appreciate the novelty of Brazilian tracks. (I only knew Interlagos and Jacarepagua I think.. lol)
I won't keep it though, and I prefer the official content of AC, and the mods too.
I WOULD keep it if EVERY rfactor 1 track and car was converted to Automobilista. ha ha
(at least the important mods and tracks)
Cos then I would replace my rFactor 1 folder with Automobilista, since it does have a few improvements though.
Not related to the OP's question, but personnally, I NEED hillclimbs (Joux plane, for example) +
Historx mod... Or at least something similar to Historx or
Power & Glory.
They're the two main reasons I keep rFactor and GTR2, and AC is my first choice.
(and of course Richard Burns Rally)
I really hope that eventually we'll get these for rFactor 2. Or at least something similar.
Cos otherwise, many people like me won't "switch" to rFactor 2.
Actually, you know what...
If Sim Traxx ported ALL of their tracks to rFactor 2, I would buy it in a heartbeat.
Of course that's not all I play, but this only would be good enough. lol
Now what... The only simulations I haven't tested are raceroom racing experience and iracing...
I won't try iRacing but maybe I'll do Raceroom... Looks great but it seems AC has the exact same features/tracks/cars...
I'm not too motivated to test games which look the same as what I already have... lol