My favorite compressor is the Inward Connections Brute, I believe an updated version with ratio control is now sold by Tree Audio. It just makes everything sound more “like a record,” I basically run everything through it that’s mono for a slight gain reduction. It’s particularly special on vocals and bass.
I often prefer to have multiple stages of less compression for general control. I’ll get a little compression first hardware on the way int to the box, then a little more for mixing for further control or vibe. But of course I also love to slam the hell out of something sometimes too and the Brute with both knobs all the way up is a special sound.
In my modular I love both the SSF Autodyne and WMD MSCL. They sound very different and function rather differently too with MSCL having attack and decay controls and Autodyne capable of parallel compression, but both work great in the modular and processing external sources in the mixing process. The Autodyne for drums is just fantastic, and the MSCL as a bus compressor is impressive for sound, size, and rice. If you are into eurorack, it’s hard to find a better deal for a pro sounding compressor anywhere than these too. There are compressors a lot more expensive that these compete with sound quality wise.
I find myself using the UAD classic emulations quite a bit for mixing and while tracking if I need a certain sound as well that my hardware can’t get, and for general control of course too. For example, the 1176 to push things forward and create presence in a way that only a FET style compressor does, or the La2a to do some further smoothing to a legato part if my Brute is occupied. Also love the Goodhertz Vulf for vibe, UAD API 2500 for all around versatility in function and sound and especially for the stereo de-linking capabilities. Recently got Acustica Gold and I’m loving the compressors on there for busses and color, and their El Rey is pretty damn magical as well for a very vibey sound, another that’s great on most vocals.