I've dove well over a hundred time in Jamaica and around 10 times in Cuba and they are comparable in my opinion.  I only dove in Cozumel a handful of times and it was hands down better way more of everything, brighter, bigger, less scared.... 
 
I have never been to the Myan Riviera but that looks nothing like Cozumel to bad you couldn't make the trip up. 
		
	
		
		
		
		
		
	
		
		
	
	
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