I'm going to say D is the Axe, but I don't like either tone really - definitely not what I go for out of my 5150.
Yeah, I'd go for the Green channel with a boost in front, but then it wouldn't have been the "grainy" distortion I've come to characterize as the 5150 distortion. This was more of an exercise.
It sounds EXTREMELY close to my ears.
I think what little difference comes thru in this could very well be the SS poweramp's doing.
The SS poweramp is just raising the volume, and with the "Post Gain" on 3, means that it's about 10-15 watts going out into the cab, which should be a piece of cake for a 1000W SS to handle. I think the coloring is 99.9% the AxeFX.
Not that similar imho...
Corksniffer.