Fabfilter's stuff is next level! I used them on everything, every mix I made since I got them, has fabfilter all over. If I were to mix with only one brand of plugins this would be them, my desert island plugins. And I'm not just talking out of my own opinion, the real pro's use these a lot too, so that says a lot about them.
I mostly use the Pro Q2, Pro C2, Pro-L, Pro-G and Pro-MB, especially that multiband comp has features which I don't see on any other plugin. I used for every instrument, and even on the mastering chain, to keep control of the dynamics