Colombia Shallow in Cozumel. You'd have to bring a shovel down with you to go down more than 30 feet. 100' of visibility. Your air consumption is really good, your buddy is an air hog. Do you really bail out of your dive when he burns his tank in thirty minutes?
How about Palancar Gardens? Max depth there is 70 feet or so but you're up around 45 feet when your buddy is low. He has 50 dives under his belt. Very little current, no chop and the boat has been orbiting above you the whole time. Still going to cut your dive short?