Flex is probably the most important factor.
For park, people generally want something super soft.
For an all-mountain boot, something with a medium flex is a good idea.
If the boot is too soft, you will flex through it when trying to hold a hard turn, if it's too stiff, then you will definitely know about it in the park.
As far as particular boots go, get the one that fits.
It's hard to give an indicative flex rating too, as there isn't really an international flex scale (boot companies differ in how they rate flex)..
Plus, it depends on how heavy/aggressive you are, which we don't know.
A good bootfitter will get you into a boot which fits right and is the right flex for your needs.
Get custom footbeds too. You definitely won't regret that.