I own a lot of tanks and regulators, and all of them are DIN. That is because i do a lot of technical diving, and that calls for DIN. When I was a middle America recreational diver, my regulators were yoke. I had never even seen a DIN regulator until I ordered my own in preparation of tech classes. If I were to drop all my tech diving and go back to recreational diving only and then buy a new regulator, it would be yoke. Here are some stories from my recreational diving in the last few years, all dives done with two friends who also have DIN regulators.
1. When we registered for diving in Palau, we specified DIN, but when we got on the boat, we had yoke tanks. Fortunately we had brought adaptors. The dive shop got us DIN for the rest of our weeks there, but we were almost always the only ones.
2. When we signed up to dive in Taveuni in Fji, our travel agent, who does nothing but dive travel, notified them that we would be using DIN and nitrox, and they told he it would be no problem We did not bring adaptors. When we got there and they saw we needed DIN, the diving director was clearly stressed. He went out and came back later with 6 DIN nitrox tanks. I have no idea where he got them--probably borrowed from another resort on the island. They had no DIN nitrox tanks of their own.
3. On the same trip as #2, we were on the main island of Fiji for a week, and we had nearly the same experience. They did not have the DIN tanks we needed when we got there, but they somehow scrambled to get them.
4, For a trip to the Cayman Islands, we called ahead to both operators we were using and were assured that DIN nitrox tanks would not be a problem. In both cases it was a problem, although they were somehow able in both cases to get us the tanks we needed.