So a 88 degree is better for freeriding and a 90 degree for park? Is that correct?
The closer your base bevel is to zero, then the "catchier" it is going to be. That said, the closer it is to zero, the quicker it will be edge to edge. For a freerider, then, closer to zero is good because you don't have to go thru a larger range of motion to transition to a new edge. Rarely is a freerider side-slipping on a flat base. For a box/rail rider, closer to zero is bad as side-slipping on flat base is exactly what you want to be doing. For jumps and pipe, I really don't know. I can see how you'll probably want a little forgiveness from more base bevel when landing, but I can also see how a lower base bevel could give you more "oomph" on takeoff
Once you decide on a base bevel, you'll want the side angle to add up to around 90 (ie 1 degree base + 89 side or 2 base and 88 side, etc.) Anything greater than 90 will feel dull, anything less than 90 will feel very sharp but will dull up quicker.
Personally, I freeride on the Ice Coast. I like a 1 degree base to get a little bit of forgiveness on the occasional skid and a 88 degree side to get an 89 degree total. It gives me a little more edge hold on ice.
All I can advise is if you're going to change from the factory specs, do it a little ata time (half to one degree). You can take it off, but you can't put it back on.
Take a gander at
Tuning - The Carver's Almanac
If you ride a lot of nice powder, then edge sharpness isn't really an issue