haha. these skis are soooo different. the stl is a pure park ski. take the old 1260s, and fix any flaws they had, and make them bigger, you have stls. they are almost symetrical, have an incredibly soft flex, and have a ton of pop.
the MSPs are big stiff boats. they are pretty pintailed, so they are very stable, but not quite as good switch. its an all mountain ski that can ski everything pretty well.
both skis are light, and 4frnt is a great company, but depending on the type of skiing you do most, there shouldnt be much question, as they are very different skis.
opps, that was free advertising.