I recommend:

Basics: Spyderco Tri-Angle Sharpmaker Perfectly adequate for 95% of users. Get a set of Diamond or Cubic Boron Nitride stones if you have high-end steel blades and want to get serious, as opposed to just touching up and edge.

Intermediate, can do mild to wild, just takes some effort: Vipersharp https://vipersharp.com/

Advanced as you want to get from mild to wild and stupid simple to use. This is definitely what you want if you want to seriously get an edge on: Wicked Edge https://wickededgeusa.com/

Electric: Work Sharp. https://www.worksharptools.com I prefer the Ken Onion Edition as it is the most capable.
_________________________
Doug Ritter
Editor
Equipped To SurviveŽ
Chairman & Executive Director
Equipped To Survive Foundation
www.KnifeRights.org
www.DougRitter.com