I’ve got both, the Xpressor 19" and the Drawmer 1978.
Xpressor: a very modern and precise sounding VCA, sometimes with a little silk when the warm-mode is engaged - but just a little - handling is top-notch - you can put it on the master and won’t be disappointed, regardless what kind of Music you put into it makes it better and you could hear and feel it - and because of i’ts fast attack and release you have also a peak-limiter when used with care. With all the options on the comp you can get very creative. In my opinion the Xpressor is made for electronic music.
Drawmer 1978: A colorful sometimes dirty sounding and superfast bus-compressor with a FET-circuit, harmonic-options and a genius sidechain EQ … for example to control the energy of a snare at a certain frequency-domain when used on the drum-bus. I use it for the AR - makes it sound very organic
when you use the 500-series you will lose the sidechain on the Xpressor but you can transport it everywhere
although the Warm is more affordable, you don’t have a mix-parameter for parallel compression and you get this SSL-vibe (the glue)
in sum investing in a hardware compressor is a good idea and i guaranty some surprises soundwise when you compare them to software-comps
anyway, get the Xpressor