Both deeds transfer ownership and include promises, called warranties, about the title. The difference is how far back those promises reach.
A general warranty deed is the strongest deed in Florida. The seller promises that they own the property, have the right to sell it, and will defend the buyer against title claims from anyone, including problems that started before the seller owned it. Florida's statutory warranty deed form in chapter 689 carries these full warranties.
A special warranty deed limits the promise to the time the seller owned the property. If a defect came from an earlier owner, the seller is not responsible for it. Banks, builders, estates, and trustees often use special warranty deeds because they don't know the full history of the property.
Neither deed should be confused with a quitclaim deed, which makes no promises at all.
For a buyer, a general warranty deed and title insurance together offer the most protection. For a seller, a special warranty deed limits future risk. At QuickDeeds, either warranty deed is a $350 flat fee, plus costs and expenses.