I've never owned a tube amp before, so please forgive my ignorance on the subject, but I thought that the Solstice and Starlight were both tube amps? I'm just looking for a good first tube amp that I can try out with different tubes.
Both are tube amps but the circuits are slightly difference in how much you need to do to roll different tubes and the tubes are used in the input stage while the output stage is SS/op-amp:
Ember sets tube voltage and bias automatically
Solstice set tube bias automatically but you need to adjust the voltage for each tube family
Starlight is manual tube voltage and bias