Short answer:
Diezel Hagen
Long answer:
I always have my amp-top rack with cables/power, MIDI controlled Timeline/BigSky, and an RJM mini amp gizmo. So I can grab either the Hagen, the Diezel Herbert, or the Bogner XTC 20thA and all will be MIDI controlled and "just work" with all my pre-programmed MIDI patches. I then choose either an old VL Ground control (that gets phantom powered by the rack), small pedal board with RJM LT MIDI controller/wah/fuzz/drive/phaser/trem and MIDI controlled 4-loop switcher, or the big pedal board with RJM PBC10 and all sorts of pedals including psychedelic and synthy ones. So it's mix and match depending on the gig.
Last week though I also got a Marshall JVM410C 2x12 combo. This now means I can be lazy and just grab that and it's footswitch, or just grab that and a delay pedal to go in the loop. Or, since it has full MIDI implementation, I can actually now use that as a "just works" 4th amp option for the rig above if I want all my usual song presets and/or the spacey sounds, but still want to travel lighter. Sure, the JVM410C isn't the lightest combo, but it's 35 kgs when my Diezel Hagen head in it's flight case is 40 kgs alone, so still a saving!
Hagen is the default though as it has the big Diezel sound I love, but sounds a little more "rock" focussed and slightly less "metal" in my head, so is my best compromise of everything amp. I've definitely been liking the JVM410C though this last week. The combo cost less than a 3rd of my Bogner head here in the UK and it's a do-it-all package in a sensible size.