there is no difference between "freestyle boots" and "all mountain boots".
at the end of the day, if it fits your foot, it fits your foot and that's the boot to ski in. for the most part "freestyle boots" are just boots with some fancy colours.
look at a lot of the top pros out there, if you pay attention to their boots, most are not skiing in a "freestyle boot". you'll find a lot are skiing in "race boots" because they fit their feet the best. there are a ton of edits out there where tanner hall is skiing in a Dalbello KR2 Pro and not in his Il Moro T "freestyle boot".
go into a bootfitter with an open mind and listen to what they have to say. you may not get a "freestyle boot" but your feet will be comfortable