I think peanut butter is a good survival food but I have to agree with Doug_Ritter that it is thirst provoking. It is also high in salt. So don't depend on it if it is likely that water is going to be critically short.

Florida, with a high groundwater, heavy rains, and lots of surface water is not likely to be in short supply. The water will need treatment but there is seldom any shortage.

If you are buying a ration for storage in a life raft pack on a airplane or boat that operated primarily over salt water, a situation where there is a good chance you are going to start short of fresh water and only have it get dearer as time wears on, you are going to want to go with the Datrex.

If you are more far more likely to be in a situation where drinking water will be plentiful you might save a bit of money by including more peanut butter and less Datrex.

It seems wise to always include some amount of ration that doesn't induce thirst or demand water to eat.