Thanks and I had done some reading and agree on the BA3, the other one apparently ran into some reefs after a mooring broke.
Would you say the Cozumel dives are better or similar to Belize?
Based on reading it feels like the diving in Belize will be less busy and apparently the night dives there can be spectacular.
That said, your post has inspired me to try and make a trip to that part of the world!
IMO the dives in Belize are a few degrees better than Cozumel especially if you take a liveaboard and head east. The reefs are very healthy with a good mix of both soft and hard corals when I visited in July 2023. I saw numerous Caribbean reef sharks and nurse sharks swimming amongst the reefs. The density of fish on the reefs in Belize is a bit more compared to Cozumel (but nothing like Thailand where the schools of fish swarm around you like The Blob). The night dives off a liveaboard in Belize are quite spectacular (except for the bloodworms).
The diving in Cozumel offers great opportunities too. Fortunately, the reefs in Cozumel are recovering nicely from the 2023 bleaching from heat stress. Some of the coral formations towards the south end of the island are amazing. They look like mountains rising out of the sand. Sharks tend to hang out at dive sites at the southern tip of Cozumel.
With your level of diving experience, I suggest you look into diving with Aldora Divers on Cozumel. They offer a wider choice of dives different from the normal ones in the marine park. Aldora is famous for their adventure dives, blackwater dives, and charters to the east side of the island when conditions permit. When you dive with Aldora, the staff assesses your diving and then groups you with divers of similar skill level. You might find yourself on the first day diving with a bunch of less-skilled people, but bear with it as Aldora DMs will get you on the boat with more experienced divers. You will have to go through this "assessment" if you want to sign up for the adventure dives as the staff want to see your buoyancy control, gas consumption, comfort in the water, etc.
I really enjoy the 3-tank adventure dive because the boat goes north of the island. Very few dive operators on Cozumel go north. The dive starts with a lionfish hunt, then a dive to the cavern of sleeping sharks (I have visited twice and never seen them there), then a shallow dive. During the surface interval between dives 2 and 3, the boat captain serves lunch of ceviche made from the lionfish harvested. My friends and I did a trip to Cozumel in November/December 2024, and I offer you my trip report:
Cornbread's November/December 2024 Cozumel trip report. I wrote about Cozumel diving and cenote diving.
If you're into blackwater diving and the photography, world-famous Robert Stansfield offers charters on Cozumel. You can check him out and coordinate with him through his Facebook page under the name "Blackwater Cozumel."
On Cozumel, I suggest that you do not book a stay with the all-inclusive resorts. Instead, book a stay in the town of San Miguel or close enough to walk into town. You will enjoy the variety of restaurants, bars, eateries and the vibrant activity the town has to offer. The town is quite safe to walk around in. For comparison, when I was in Belize City a few days before my liveaboard departure, the locals warned me against walking around after dark.