My advice would be to first decide what you want your sharpener to do. If matching your factory bevel is highly important to you then systems like the kme & edge pro will serve you much better, both in their infinite adjustability as well as wider adjustment range.
You should also decide if you want to maintain a zero edge or a micro bevel. If you decide on a zero bevel, then again it's the kme or apex. Both systems offer consistent and easily repeatable results. (It helps to keep notes for each blade; measurements of blade placement, angle settings, depth of blade in clamp. )
When I was researching sharpening systems I had originally settled on the kme. It is an excellent system and I was a hairs breath away from placing my order. Then I started playing around with my lansky Turnbox on some beater knives and discovered the micro bevel. I did a lot of reading on blade forums and fully researched the concept and application of the micro bevel. This radically changed my sharpening approach. I decided against the kme, and instead I bought a dmt magna guide and a Spyderco sharpmaker.
I feel this is a great combination because the dmt diafolds reprofile blades easily, are very versatile, can be used free hand and are super portable. The sharpmaker is, imho, the best system for maintaining an edge. It will give you scary sharp edges quickly with minimal effort and without all the fussing around with clamps and guides. However, It wasn't designed to reprofile an edge and isn't, in my view, a stand alone single solution sharpening system.
Sorry I got long winded...here's the synopsis. I reprofile all my blades with the magna guide first. I don't use it until I need to reprofile again. All of my edge maintenance is done with the sharpmaker and a strop.