The Sorado and 200S are the same 60 watt bass amp, the Solarus is a reverb/tremolo guitar amp that had a few versions, but mostly 40 watts and in a combo configuration.
The 2000S is the "daddy" Sunn tube bass amp, 120 (tube rectified) or 150 watts (SS rectified).
They are similar tonally, it mostly depends on how loud you want to get.
Keep in mind, a lot of the legendary Sunn "loud" has to do with the cabinets, and a
lot of the "mud" was in the Gibson mudbuckers and the players hands. The Sunns themselves are fairly clean, hi-fi amps.
You can get tons of Sunn info at the "
Unofficial Sunn Forum",
plenty of knowledgeable Sunn geeks there.
