Yes, the eating seasons are similar among the Reed, Holiday, and Nabal. But some other qualities are dissimilar.
Fruit of all three taste excellent to me. But a slight nod would have to go to the Reed and Nabal over the Holiday. That's just my taste though.
If I were choosing to grow a Nabal or a Holiday, I would grow a Nabal provided I had the space to let it get at least 12 feet. Nabal is more productive from the trees I have and the trees I've seen. The only downsides of Nabal I've noticed are that it gets thrips damage (which is only superficially ugly) and its skin is thick like a shell so you do have to learn to judge its ripeness by toothpicking into the stem or another technique.