Yeah did previously own an ad200 which is a lovely amp in it's own right plus it's lot lighter to carry than the gt200!
In short, the matamp > than the orange. Tone is a subjective thing, but for me the matamp is perfect. Both good amps though.
It's louder, has more depth, thicker tones, more snarl and is obviously extremely well made.. How much of the immediate tonal differences are attributed to the jj KT88s in my power section as appose to the 6550s in the orange, I don't know.
The matamp is also definitely less 'peaky' than the orange in terms of the compression you get from the valves...smoother response, more natural sounding.
I'll post some recordings when I can. I've got clips of the orange and the matamp somewhere....