All emirates offer beach holidays and everywhere there are good beaches. You need to focus on the budget that you have for the trip, as well as what else, except for the beach, is actual for you: shopping, nightlife, entertainment, etc.

Any emirate is suitable for beach holidays, it all depends on the budget.

There is a difference in the emirate of Dubai. Here you can live as in a city in budget hotels that provide free transfers to municipal beaches and the Jumeirah coast. Accommodation on Jumeirah is one of the most expensive vacation options.