Not sure what's allowed in Florida, but in Colorado, OSB is used over CDX plywood on nearly all new construction. The reason being is it's about 25-30% cheaper than the CDX.

My experience with it tells me it's not as strong as plywood in "real world" testing {regardless of any controlled experiements which may say otherwise}. In roofing, I've also found it does not hold the nails as well. We've seen a fair amount of wind damage where the nails themselves actually pull right out along with the roofing material.

My belief is that many times, new products are created, then given claims which state the new product is better than the old, when in fact it's really just a matter of the new product being cheaper to buy. That said, OSB is approved in most {if not all} areas I know of. I use plywood anytime I have a choice, and if the homeowner doesn't mind paying the additional cost. I do use the OSB on those occcasions when it can be used AND it's required due to the constraints of the homeowner's budget.

One who enjoys helping with roof problems, for the fun of it.