I was gone when
@Sleazy Car Salesman was going on about Dark Heresy and my experience with DH has been very small. I like immediately went to Black Crusade as a game I was a player in and Only War as a game I was the GM for, but man people who cannot fathom percentile games and the system in general makes me sad. D20s are fine, but the 40k's system was very solid with many factors to adjust the rolls. I feel players had a lot of choices in how to react to things with reactions being more than "Attack of opportunity" or "attack of opportunity but spicier".
Also I'm a sucker for soak damage mitigation systems in RPGs
Unless you're running for some adventure league thing you can take or leave canon stuff like that. When I ran my Starfinder game I did as much of that as I could, but I still fell through. I just didn't fuck with the system.
One day I'll stop being a coward and run a game using some Genesys shit. I know narrative shit is a contentious topic, but I enjoyed the FFG Star Wars RPG system for things so maybe it'll work or I'll fuck it up majorly.