Been to Maui several times including my HoneyMoon and it’s the BEST Island of all of them in my opinion.
I’d recommend staying on the LaHaina side at either the Hyatt, Weston of Sheraton. Review them all to see what appeals to you most. Sheraton is my vote and PRIME snorkeling right at your doorstep.
Been to Oahu once. It’s like San Francisco with nicer water. I’d check out: for best info.

In Oahu it’s more about the water and the beachfront then it is the hotel.
Make sure you eat at Duke’s!! Mahi Mahi sandwich is BEYOND compare to ANYWHERE I’ve ever been.

Somehow your question came through twice. The next one has some good answers. Aloha!!