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I live in deep Southwest Texas, right on the Rio Grande where it can get quite hot.
Closed cell will give you a much higher R value than open. Closed cell will not wick water like the open will. Closed cell will also add structural integrity to the building. If you home were to get hit my a hurricane or flood, you will happy that you went with the closed cell vs the open.
I can supply you with a ton of information on the differences.