plywood or osb3

Just wondering if anyone has sheeted out their attic and what is the best material to use

Its either plywood or OSB3


The attic will be used mainly for storage even though there is plenty room for conversion at a later stage if needs be (9X2's used for ceiling joists)

What are the pros and cons of each

Id always go for plywood. Should the OSB ever get wet it will rot very easily and you could put your foot through it