Hi!
I used to have a full SS rig I would use at one point. Had tube issues on the road, and got pissed and sold the tube stuff, bought SS. Went back to tubes, got irked again, etc.
MosFET type amps are a bit more tube like, so you can typically get a bit more of that response form them. Not all SS power amps are equal.. some are really "stringent" when it comes to response. FRFR, and they won't budge from it. To some, this can be perfect, as they craft their tone and feel the "reliability" of the tone is worth it. Chris Poland of OHM: (ex-Megadeth, **** the Machine, etc) uses a Bogner Fish with a MosFET type power amp on the road for the whole reliability side of things. I ended up with a hybrid in the end for the very same reasons.
Now that I am strictly studio work though.. well.. each day has tube heads calling to me. The full circuit interaction and flow versus split pieces is another story too. Try stuff out. Bring guitar, bring pre. Bring cab if you can. Or, if you have the ability, buy used, try, resell.
Certain power amps are known to be more guitar friendly, such as the Carvin DCM150. Single space are more rare, 2 space less so. Ton of choices!!!