Not to sound like an advertisement, but the smoke on the water split fins are the best out there. Stiff enough for moderate current, but still forgiving on the legs. It's really all about what you are comfortable with.
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I'm a little reticent to post a differing opinion because of the respect I have for folks like Dan that regularly dive in very difficult current. I have both splits aned blades. In little or low current I notice virtually no difference between the 2 when doing the frog kick. I used my splits in Palau where it was necessary top go against the current for short sprints (to get to the wall or whatever) and I was able to do everything anyone else could do. Splits CANNOT go backwards. If you are going to do wrecks or cave diving or anything where you need to backup you need to do two things. Use blades and practice a bunch. You need to develop some new muscle tone. I don't doubt that the blades are better against the current but I can only imagine a difference in the most extreme conditions. And I have used splits in some failrly extreme conditions for short sprints. Now I do train for a month before I go on a dive trip. I go to the pool and do 2 plus miles 3 times a week to get my legs ready and I bike on the other days so my legs are fairly strong. That may or may not be a factor. I always use my blades when I'm going somewhere with draconian weight restrictions because the splits (scubapro jets) are twice as heavy, or if going to a wreck diving location. I guess I'm saying that for 90% of recreational diving it won't make much difference which you use.