I've been told that sharpmaker would be a faster for quick touch ups.
After reading a lot about apex, and talked with some guys that had both systems, I plan to to maintain both! (I was about to sell my sharpmaker and buy a Apex)
The apex system is a lot more messy, but it will provide a lot more stable sharpening, and a better edge at the end with less trouble! Oubviously that are guys around that can achieve that hand only, but I don't have the time to pratice it that way! Also it is possible to vary the angles, use a lot of stones... etc..
I was to buy it before I bought the sharpmaker, the sharpmaker is pretty good and small! But by then I already knew that was a matter of time...