Both are good, for different reasons.
I have several guided systems (2 Lansky sets, a Gatco, and a DMT Aligner & Magna-Guide set, used with Dia-Folds), and also have a Sharpmaker. The Sharpmaker is very useful as a maintenance & light touch-up tool. In that role, it's a very quick & easy solution for the occasional touch-ups needed on kitchen knives and other daily-use knives. However, attempting to re-bevel an edge with the Sharpmaker will be slow-going, because the hones aren't very aggressive. They're much more useful as finishing/polishing hones. The Lansky is much more adept at complete re-bevelling of knife edges, but might be a tad cumbersome & tedious to use simply for light maintenance. I have the Lansky diamond kit, with the four hones as described earlier (XC/C/M/F). I originally bought a Lansky 'Deluxe' set with the standard carborundum hones and the two ceramic finishing hones, and managed to wear a couple of the carborundum hones out (they're not flat anymore). I supplemented that kit with a medium diamond Lansky hone, and it did most of the grunt work. I eventually retired that set, and bought the full diamond kit. I've been very happy with it. As mentioned earlier, I've also relied mainly on the medium and finer hones. The coarse & XC hones don't get used as much.
I use all of my guided sets for re-bevelling only. All of my other maintenance sharpening gets done by other means, including the Sharpmaker.