i have 195 mo'ships i'd be willing to sell for cheap if you want the big ones. they're this year's model with less than 20 days on them.
in response to your question, the prophets are a great ski. they seem to have an easier turning radius than the mothership. get the mothership if you want to set a new land speed record in choppy snow and not notice a single bump, send big cliffs, and/or have the gnarliest skis around. otherwise, go with the prophets.