I class fins in three catagories.
Jet Type (sp jets, turtles rockets etc)
Traditional paddles (hinged fins excluded)
splits
I have SP Jets, USD original Blades and Apollo original split.
I find the splits to be REAL FAST. They require a different kick than the others and seem to work best if I fin through the hole in the water my body makes. They also require a couple extra kicks it seems to break from a dead stop and get me moving. does not frog as well for me as the other two. By far the easiest on my legs. Heavy, but feel nuetral in the water. I find I have to "think about" them though to make them work right.
The Jets I find I need to work harder to go as fast, but they feel "nimble" and are the easiest for me to frog kick. They have a good all around control and feel "precise". They are as heavy as the Apollo's but feel more negative in the water.
The USD Blades feel just right and for me, seem to be a good compromise. More effort than the splits in a straight line, but less than the Jets. Less precise than the jets but more so than the splits. Lighter than the others.
My opinion, the Jets will be the best for me eventually with a little more conditioning.
I am swimming laps with them as often as I can.
The Jets were my fin of choice my first 10 years of diving. When I started my second life in the pond after long break, I jumped in with the splits and the hinged fins. Stepped back to the USD blades (no longer made unfortunately) and find now that it is all said and done, I wil be back to the Jets.
my $.02.