Hawaii overall is nicer and more expensive than Florida, however Florida easily has the better beaches. Snorkeling is going to be better in Hawaii, but the beaches themselves are pretty rocky and kind of mid, to be honest. Florida knows its beaches are the money makers and goes the extra mile to make them nice. The sand is well groomed and it’s that powdery white sand that feels incredible.
Florida would be the better option imo. During that time frame it won’t be tourist season, so those beaches won’t be over crowded either. Florida beaches get kind of nuts at spring break time. The flipside of that is that not everywhere will be open. I visited Destin in Feb before and some of the more tourist spots, like Shed BBQ for example, were closed.