I have used both, the OTS and the OceanReef. I own the OceanReef. I use it for several types of diving... Lake dives that could become a mud hole as soon as somebody touches the bottom, golf course ponds when I dive for balls and when I’m diving on the dive team. I still use a standard mask and reg as well. You will find that it has it’s time and place. I have a quick release on my air hose so I can swap from the FFM to the standard reg in 3 seconds. The OTS seems slightly easier to equalize if your new to FFM. Once you use a OceanReef , like anything else, you learn how it works. The biggest thing to know about the OceanReef is that you will find it more comfortable to use with the proper length hose, swivle , quick disconnect and surface air valve (SAV). The SAV is a must. It’s about $50 if your doesnt come with one. It allows you to breath surface air and talk while above water. You would think the mask would come with these options for the price you pay. You need to wear you Octo reg on a necklace and a back up mask in a pocket when using a FFM. Of course be sure to learn the mask in a pool before you go open water with it. I always use a 19cuft pony (redundant air source) for my back up rather then pulling from the same bottle. Hope this info helps, feel free to hit me up with more questions. My team is about to get the state patrol surplus mask ( 1 year old) that have the visor lights and heads up display in them. I have not used these options , so it will be new for me . All in all, I love my OceanReef mask. A lot of research goes into a product before the state patrol buys anything. They just have deeper pockets and get new stuff more often . Good luck with your purchase and stay safe over seas.