For only one amp I vote for Hagen. Especially for live playing. Hagen has 4 channels, has midi, 3 great fx loops(I think it’s done better way than on vh4) and it has 2 master volumes, so you can use any channel for your rhythm, and any of them for soloing with another master volume set louder.
Very underrated amp, I think as years go by it will get more and more attention, as vh4 and Herbert.