You’ll get a lot of hate for MRADs from people who have no experience with them. Had an MRAD, now have an AX.
First, AXMC to MRAD is a better comparison as AX is short action only.
Without going to deep into it, the AIs are ‘nicer’ and I think have a higher appeal and satisfaction of ownership due to the action feel, iconic look, and other things.
MRAD is a more modern design with a whole lot to speak for it, but it looks like an RPR. The action is lightning fast and impossible to bind, but still feels a little cheaper as it rides on polymer sleeves. AX series AI rifles have a lot better stock adjustability, so there is that.
MRAD is just as good, probably better than the AI for work in a lot of ways. For your own money, the AI is just nicer.
My thoughts after having both for a while could be summed up as “MRAD to get paid, AI to get laid”