Depends on the music style, I guess.
I just use the Orange channel on my 2 Ch. Dual Rectifer, set to Vintage mode. (Has a nice, thick, gooey feel, too.)
The Bogner Ecstasy sounds pretty decent on the red channel for lead, but in general, I feel like the amp is "too refined" sounding, and like it's lacking highs. I think this could depend on the cabinet you use it with. Great for rock stuff, though.
Mark IV on Channel 3 is pretty decent, too. I"m not real crazy about the other channels on the MkIV. (I've been itchin' to try an old MkIII again. I used to like those quite well.)
Haven't had much experience with VHT, though.