1. Waves CLA3A
The CLA3A works good on everything. I use it all the time. Mostly it’s the first plugin in my chain, whether I’m mixing drums, vocals, guitars, it doesn’t matter. It’s super easy to setup and bring whatever you’re compressing more in-your-face right away. The CLA2A is also very good.
When I’m mixing vocals the RVox is one of my go to plugins. Mainly for the same reason as the CLA3A; it’s easy to setup and brings your vocal more in-your-face. I usually put it at the end of my chain.
3. Waves C4 multi band compressor
I love the Waves C4 cause of it’s control. You can compress each frequency band very easily. I like to use it as one of the last plugins of my chain, after EQ, to smooth it out a bit and make sure none of the frequencies get out of control. I use this for almost everything.
4. FabFilter Pro-C compressor
If I want a very neutral compressor that just does the job without adding too much of it’s own characteristics then I grab the FabFilter compressor. Also not too hard to setup with great results.
It’s actually more of a limiter than a compressor but I love it so much that I had to put it in this list. I always use it on the master bus (when I send to mastering I send 2 versions; 1 with L2 and 1 without) cause it kinda glues the mix together and brings up to overall level. I always use it at the end of my mixing stage and adjust the balance of the mix after I put it on there.