I have them all. The electric Chefs choice does a fair job on kitchen knives but won't handle a thick hunting knife and it won't sharpen the rear 1" of the blade. The lanskey does a great job on every knife, with the different stones you can quickly sharpen a badly ground knife then maintain it with the finer stones. The easiest is the crock stix. which are a pair of round ceramic stones that fit into a board at a 20 degree angle, by cutting downward on them you sharpen your knife. It does a good job . The only draw back is if you have a new knife the angle might not be 20 degrees and since there is only one stone it would take quite a while to re-do the angle to get the knife sharp. The triangle seems like a similar set up, if it has different stone grades it might be better . If I were to get only one I think I would go for a "Gatco" ( from Cabelas) very similar to the Lanskey but with wider stones and a better rod attachment system. The trouble with the lanskey is the plastic where the guide rods attach has broken on 3 of my stones. I would stay away from the diamond stones . My diamond stones for my lanskey wore out. That is the diamond dust is glued onto a metal bar the glue wore off making the stones usless. Hope this helps.