I voted wicked edge. As a professional, this is the system which gives me easily repeatable results and I can be extremely precise in where I want things. I've used a KME, an Edge Pro, and a DMT. Of those, the wicked edge gave me the most consistently precise results. I would put the KME in second place because the blade is clamped and all you have to do to change sides is flip the clamp. People have mentioned that they've had trouble with the Wicked Edge clamp and FFG knives. I have a gen 2 with the twin screw adjuster setup and I have no issues with securely clamping FFG knives. If you are having issues with this, you just need to set the blade in the clamp with the key and alignment guide for repeatability, adjust the top screw tension until its just holding the knife in place and no tighter, then adjust the bottom screw until the jaws of the clamp are contacting the flats of the knife. I do all manner of Spyderco FFG knives including a Maxamet Para 3, a military, a manix 2, shamans, and others and have no trouble with FFGs.
All that said, I still keep my old school Japanese water stones around because there are things which ANY guided sharpening system can't do well. Like 300mm long 70/30 beveled Gyutos and even longer slicers. Sure, I could get one sharp on any of the guided systems named, but they wouldn't be where I would want to put my name on them.