In order of how much I use them...
PC4K S-Type Channel Compressor ... This my goto
PC4K S-Type Expander/Gate... I use the gate of this primarily
PC76 U-Type Channel Compressor ... Use this occasionally to my ears this is the least evasive
 
Been trying to use this more
CA-2A T-Type Leveling Amplifier:
 
rafone

As others have said, the CA-2A (what a strange designation?) is a very good software comp.  The PC4K buss comp is great, also, for, well, bus duties.  The 1176 works pretty good, too, as a software comp.  It does not stand up next to the analog, but maybe that is because I use that going in so the artist can "play" to the 1176.  I just know I've never gotten that 1176 shaping - the edges an analog 1176 gives, once in the box - and that includes other soft 1176s.  It is a subtle thing and not on everything, but when it is there it is obvious.
 
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The CA-2A is terrific and my bread and butter go to on tracks.  The other compressors are quite good, as well, and the key to them is where you set the threshold and makeup gain level.  Once you get them set, they work their magic.

CA-2A is great and it's the best $20 I ever spent on Cake plugs (I got it on special then upgraded to the full version using the last $20 coupon we got). I use it quite often however the other comps have been great too and serve a different purpose for me.
 
If I need more control over something or really want to smash something (like a bass part or I simply want to hear the compressor) then the other ones allow me to do that without using the Sonitus, multiband or whatever. I take care of the bulk of the messy stuff with those and then soften it with the CA-2A if need be.
 
It should be noted though that my material tends to be very aggressive but has nuanced moments that may not sit in the mix well and my gear is questionable so that two stage compression has helped me.
 
There have however been many times I liked the sounds of those included PC compressors on their own. Just depends on the material.
 
Thing is... you may just not really NEED a compressor on your material if you are not liking the results. The CA-2A is really subtle and personally I think of it as more of a polishing than a full on compressor. Ideally you don't WANT to use a compressor in post because your raw tracks are good enough or if you do you don't actually want to "hear" it.
 
Maybe your input signal is just that good... which is the type of "problem" you want to have... as opposed to the mess I deal with a lot of times... but am correcting. lol

For me, it's Concrete Limiter on drums, sometimes bass, and to even out level variations in vocal tracks. The CA-2A gets the nod for the actual vocal compression; for bass, I tend toward the 76. The PC4K gets the nod for stereo drum mixes when I want something subtler than the Concrete Limiter and the parallel compression parameter is handy. Overall i find the ProChannel dynamics processors have pretty much all I need except multiband limiting.
 
 

Here's a snippet of a song I was mixing last night for a local band I recorded. Lots of CA2A and Concrete Limiter and a little bit of PC76U. Also some Waves CLA76 here and there but, really, the bulk of compressor duties are being handled by the Pro Channel units.
 
 https://soundcloud.com/st...-tuscarawas-river-band