The Dr Z was not really Marshall-like. It had a very even frequency response (dare I say hifi), with lightning fast transients. It was very 'clean', but had a wonderful, sustaining tone when pushed by the boost. On clean parts, using a neck Trilogy Suite, with either the Univibe or Leslie settings on a BOSS RT-20, the sound was very clean and had a great "chime" to it.
The one area where it didn't stack up to the Bruno was with feedback. When you're pushing a Bruno hard, and you stand in the right place, you get the most wonderful harmonic feedback that sustains notes into infinity. The Dr Z just became a screechy mess when you got too close. PDT_008.
It comes down to sonic preference and what your specific needs are. I think that a good sonic 'crossover' between the Dr Z and the Bruno would be a Komet, but as noted above, the Dr Z provides a lot of bang for the buck compared to other boutique manufacturers here in the US.