They are quite differnt skis. The al dente has a soft long noise rocker with a mid flex underfoot and in the tail. at 98mm they rip all mnt, they are fast edge to edge and can float in some pow. I loved carving on them and they still feel nice and plafull. Maybe a bit big for true park use, but as an all mnt ski they are great.
The sfb certainly feels bigger and heavier. The nose is stiffer on the sfb slightly but tail and underfoot are similar. It has a much more symetical feel then the al dente though so feels more like a tradional park ski. Because of this they dont carve quitre as well as the al dente, but being wider they are a little better in pow. In the park they are a little big, they weigh quite a bit and dont have a ton of pop.
Of the two the al dente may be your better all round choice, but if you are still looking at spending a fair bit of time in the park, maybe keep looking.