its hard to compare it with birch because birch is a park as a whole where as aly only has a small portion reserved for the park. birch is bigger then aly's park but the legitimacy of the jumps goes to aly because, unlike in fairbanks, everyone throws down so they can build them bigger. but there are only 2 jumps at aly where as there are much more in fairbanks. and rails are rails they are about even both places.