I am more of a tube fan, so the MPulse line gets my vote - particularly the Walkabout. I had an MP600, and it was a very nice amp with some cool features (Solo level, pre/post EQ on the DI), but the WA just has more tube influence in it than the other MPulse amps (360 and 600).
OTOH, I did not care for the Carbine/M3-6-9 series amps, primarily because of the much reduced tube influence in the tone (IMO/IME), and the 5 position, fixed mid control design.
I have owned and gigged a Buster 200 in the past and while it is an all tube amp, which you would think would be great for a tube guy like me, it is one of the most linear designs around and often sounded more SS than many of the major SS amp brands. Again, this is just IMO/IME.
So, my Mesa vote goes to the Walkabout. For me it's almost a perfect amp. My only complaint (and it's a modest one) is that I wish it had 2x or 3x of the power avail for more clean headroom as I seek clean and warm tube tone, and NO distortion/grind.
good luck