I asked this same question and most people said they liked the Scrapizashi more. The big difference is in the handle material, the Scizzy has a traditional wrap. The specs for both companies are on thw Swamp Rat forum on Bladeforums.

I got the Scizzy (no Waki) and love it, I also have the Swamp Rat rucki which is shorter and is still available for pre-order and the Swamp even has some in the store right now so no waiting.
If Dan makes a Scrap-a-rucki, I'll pick it up.

thanks for serving and have a great Christmas

MM