The M9/13 is getting a fair bit of use in the pro world too - Foo Fighters, Smashing Pumpkins and Thrice have all been using them (off the top of my head) and I'm sure there's plenty of other players outside of my usual noisy rock listening too.
Haven't messed with the Adrenalinn but from what I have read/watched it doesn't look anywhere near as well set up for live use as the M9 is. I think the instant access to a bunch of different effects/tones on the M-series is a big plus for stage use.
Pretty sure the Adrenalinn doesn't have a tap tempo footswitch on board either, so you can't easily sync your filter effects with the song you're playing - the M9 has a dedicated tap switch always available.
Whilst the 'linn has some fun sounds in there, if I wanted something for use primarily on stage, I'd want something that makes it easy for me to get the most out of in a gig environment, and that's the M9 here.