I've had great luck with both systems with regular recurved blades. The EdgePro, with optional stones and tape blanks, cuts faster and can leave a finer finish than the Sharpmaker, but the price tag on those extras add up. While no one here does it, you can use the EdgePro to match the original factory or maker's angle (or very close) of your blades and get them very sharp with minimal steel removal.
The Sharpmaker will sharpen any shaped blade, sharpen tons of other edged tools (scissors, arrowheads, pet nail clippers, human nail clippers, potato peelers, and many others) and serrated blades.
The waterstones on the EdgePro can be messy and they change angles as they wear down (so 20 degrees with the 120 grit hone can end up 14 degrees with the 600 grit stone), so that's something to keep an eye on. Just dowse the blade and waterstone frequently with water (in the handy, included bottle) and all will be fine (tabletop excluded). I've found wrapping waxed floss near the pivot on folding knives helps prevent swarf from getting into the pivot. Some folks use diamonds with their EdgePros. More expensive, less messy, finish not as good as with waterstones. With high grit tapes on the tape blank, it shouldn't matter too much.