I am trying to decide what the best wire stripper would be?

Doing it with a utility knife, just isnt cutting it for me, so I have found a few that I like really well, but not sure which one would be the best.



Hardin Manual Wire and Cable Stripper Scrap Copper Recycle Machine | eBay

Patented Manual Wire Cable Stripper Stripping Machine Tool Scrap Copper | eBay

There was a hand wire stripper on amazon, that I cant seem to find the bookmark for now.