I have a substantial number of tube amps, but the Mesa Boogie Road King II is one of my favourite pieces of gear. Why? Well the thing is, this amp has EL34's in there, it has 6L6's in there, it can flip between cabs at the press of a switch, it has at least two loops, it has output settable volumes, either tube rectification with a sag switch or regular rectification if you prefer that (I do). Each channel has at least three settings with small switches on the front of the amp and it's possible to 'mix' EL34's and 6L6's tubes for completely unique tones or of course just choose which tube tones you prefer.
There really are so many features on the Road King II that to write it all down could be a problem here. BTW The Road King I was not comparable as I had one of those before I bought the RK II.