I have used the Spyderco Catcherman (the newer MBS-26 version) and the Normark Folding Filet. The Normark is the EKA with rubbery plastic grips, marketed by Normark, and is my favorite. It used to be sold at WalMart for $10, but (sigh!) was replaced at WalMart with a Chinese job by some other company that looks and costs the same. The Chinese one may be just as good, I really don't know. It would be a question of materials and workmanship, the design appears identical. (For workmanship and materials, Spyderco is the best of all; design counts heavily IMO.)
You can probably find the real Normark at a fishing gear store for just a little more. The wood handled EKA is also nice, but costs about $30 and the only difference I can see is the exotic hardwood handle.