Not sure if you already made your purchase but I've used the Spyderco Sharpmaker and the Wicked Edge Pro.

The Sharpmaker is great for simple touch ups and steels that aren't difficult to sharpen like VG10 and ATS34.

If you're re-profiling an edge, working a chip out or have hard steels like 110V then the Wicked Edge is the way to go. Be sure if you get the WE Go that you have something substantial to secure it to.

In my experience, you would use diamond impregnated stones when you need to hog off a lot of material quickly. Think 30 grit sand paper.