I have created a table of all of the fins that I have used in my slalom boards over the past few years, and scored each one out of 10
My criteria is based on feel, speed, lack of spin out and control. It is very subjective, and really based on my opinion. One think that I have discovered is that a fin which is great in one board is a dog in another.

The most disappointing fin I ever had was a Deboichet SL4 40cm (probably as I had such high expectations)