An interesting question, and my immediate response is that you are using your instinct, while your husband is acting on reason, logic and moral values. That is remarkably typical of how men and women view the decision on schools, not to mention many other things in life!
If the results prove that you have a choice between state and private, look at the schools again and I think you will be able to tell which school your son will be happiest at and where he will fit best and that should be the basis on which the decision is made.
Do let us know what happens. Oh, and please have mercy and try not to talk about the sunny Caribbean any more than you have to - it's a miserably cold, grey day here!