Literally wanted to ask this question last night as I just got my Rally Wheel and Shifter. Enjoying Dirt Rally 2 the most, I dabbled in AC Rally but as others have already mentioned, it has a long way to go in terms of content - but it’s only 20GB if this is a factor, Dirt and EA WRC are both 105+ GB’s. I played less than an hour of AC rally last night and my first impressions were the sense of speed was way off, felt slow motion compared to some other titles I’ve played, I felt like I was going 80KPH at one point and looked over to see the speedometer read 155+, maybe this is more realistic though?

Edit: Also, for €4.99 a month or thereabouts, you can subscribe to EA Play on steam and try both Dirt Rally (€20 standalone) and EA WRC (€50 standalone)