Well that is a good point.  

They submitted some studies to the FDA that were specifically on polyps and the
FDA therefore allowed them to put that claim on their literature.

I do not know whether Nasonex is actually any better than the others regarding
polyps.   I doubt it.    But it is true that they are the only one to be able
to claim under the regulations that theirs works against polyps since they have
some scentific proof.  

I like Nasonex anyway because it has the lowest systemic absorbtion of any of
them (althouh all are low anyway), but it may be a bit milder than others.
Also, some prefer Rhinocort Aqua because it has no preservatives.   And Flonase
may be the cheapest......