Same here, I have both Full and Split. Love my full fins in a current or any where where I think I might need more power ie cold water, lots of extra gear. I had the opportunity to try out several mfg. Split fins, decided on the Atomic Split fins. I think they are Great; super efficient, easy on the legs, great for your air. Down side, lack power in big current and haven`t figured out how to make them scull backward to pull you away from the reef easier when shooting macro. Won`t choose one over the other because I use them in different situations. If you have knee problems would highly suggest Split fins. Try to try out as many different ones as you can as stiffness/flexability are all over the place from mfg. to mfg. Lots of Dive centers offer demos to try or do as I did the first time I saw them, ask the owner to let you take them for a quick swim.