I guess I would have put it this way:If you are an ocean person there's no answer to your question.
I don't get it either but that's fine. Don't think it would be any good to share the ocean with all the quarry divers, they are too many.
If you are a diver, then you go where you can to get wet.
If (a) ocean and quarry were equally accessible (includes location and conditions), (b) equal cost to dive, and (c) both fresh water (for ease of rinsing equipment), then you'd likely choose the ocean. But (a) is not true for many people nor all of the time, (b) is not true for most people, and (c) is not true for anyone.