Stayed at both hotels and loved them. As stated above and in spades, preference depends on what you're into. When we stayed at the HB, there were celebs congregating all over the place, which was kind of cool. I even met some Black Lightning cast members and got a pic in the elevator with one. We figured that this would be a one-time deal, so we paid for the upgraded room on the top floor with the conference rooms and the views were absolutely sensational! Using my GoPro, I took video of the sunset, which was breathtaking!
The MMM was amazing in its own right because of the short trek to the convention center, but be warned: if you stay in an oceanside room, it gets kind of damp and humid and if you stay in a cityside room, the crossing gates are blaring all day and night long.
As much as we liked both hotels, my wife and I preferred the Omni over both. Everything was top notch from the service to the rooms, the walk wasn't far and it was near many of the local eateries.