at 98mm it would be more of a wide park ski. I say no doubt go for the 112mm, that way you can slay the pow, and if its necessary you can still lap the park.
98mm
Pros - will feel more like a normal park ski if you're lapping the park
Cons - Very little flotation in the pow
112mm
Pros - Crazy fun in the pow, good for BC booters and whatnot, nice big solid underfoot for huge landings
Cons - May take a little while to get used to in the park
112 all the way