Tonewise UL, GP3, D60/D120, Sig:X, GP/DI are all pretty similar. D120, GP3 and UL could be equally "unforgiving", GP3 and UL with graphic EQ andor Sig:X were more versatile, D60 seemed a tad more raw and the really major difference will be how you're handling the amp, imo. I've played a Deliverance with FX Loop and 2nd master volume for years and it was the perfect simple amp that went from 'clean to mean' through the guitar's volume control and when I needed more versatility with switchable EQ, voicings, channel switching etc. I used the GP3 or Sig:X/UL. Then I've used a GP/DI into a PS-100 for some time. You would be well off with either choice.