Hi Guys,
The knife sharpener is the better choice if you are sharpening heads that come with a decent factory bevel or if you're good with a file. Any laminated tip head that requires a lot of stock removal on the initial sharpening will be much faster and easier to sharpen with the broadhead sharpener. Bleeders and replacement blades can also be done much faster and easier with the BH sharpener than with the knife sharpener and because of their size, many of these smaller blades are impossible to do with the knife sharpener.
I wouldn't think of sharpening any laminated tip broadhead with the knife sharpener unless the head had been filed or otherwise "profiled" first. It would take literally hours to set the bevels with even the coarsest diamond stone. I'm looking for a file that will fit in the knife sharpeners stone carrier but, as you all know broadheads have higher Rockwell hardness than most files do. I try hard to sell only top quality stuff and I wouldn't be comfortable selling anyone an accessory file for the knife sharpener that wouldn't last a long time. I've experimented with several files and they all wear out after only a few heads. A nice radius tooth file would work except that they're designed to be used paralell to the edge, not into or away from the edge the way the knife sharpener works.
I wish I had a "one size fits all" system but, not yet. I'm working on it though. If you're even decent with a file and can use that for the initial stock removal, then the knife sharpener is the better choice. If you're not good with a file, or if you're gonna be sharpening bleeders and relacement blades, then the BH sharpener is the best choice. Just wanted to clear up any confusion. Thanks
Ron