Hol Chan or Coral Gardens?

I've been looking online at the shark ray alley excursions in Belize. I found two different ones that are similarly priced. The itineraries are almost the same. Except one stops at Hol Chan for snorkeling and the other stops at Coral Gardens. Is there a difference in these two places? If so, which one is preferred?

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Hoi Chan is the entire marine preserve between Ambergris Caye and Caye Caulker. I believe the coral gardens are just a specific part of the preserve. So, I guess 1 vendor is simply mentioning a specific spot and the other is keeping it open as to exact snorkel spot. but certainly in the same general area.