My observations on the DT are it has a very full sound with lots of low mids and bass . I always use mine in the 30w mode with gain on fat channel between midnight & 2 oclock and vol at about the same. tone about midnight, i don't find it muddy but full. I boost it also with an emma or juansolo with low gain higher vol settings. I woudn't say it's picky per se with pedals but does have it's own character.
I also have good results with a flashback delay in front with minimal delay level. I love the the other channel on a cleanish setting, vol 2 oclock gain 9, nice jingly highs. As much delay or reverb as you want here. It's very versatile & dynamic.
I could see a Marshall being easier to dial in and its sound occupies a narrower spectrum (less boomy) but i think it's just a taste thing. I have a jcm 800 clone and love it & the DT.
At home it may be more appealing using 15w but quietish noodling won't show either of these amps at their best, au contraire.
Maybe you should ask an orange agent instead of agent orange ?
