i have both....my axe has a boss v2 bolt with short spring n virtue led board. shoots awesome, i dig the stock trigger with micro switch. easy to clean/take apart...though the back frame screw takes a lil longer since my allen key can't make a full turn (i can loosen the mini's back fram screw then unscrew it by hand....it's quicker imo)
i also have a nice up'd mini with lurker bolt, on/off relay, virtue eyes, violent series trigger, 2 piece .685 barrel n ape rampage board....shoots very nice and better than my axe only because i don't have a barrel for my axe yet
basically figure what your budget is, see if you can hold each gun to get a feel for them, then decide if you want any upgrades. you can't go wrong with either. but i do agree that if you're gonna buy a new mini, just get a used axe.