Really, you're comparing apples and oranges to be honest.
I use the EP, WEPS, Sharpmaker and a Kalamazoo 1x42 belt for my sharpening tasks, and they all have their strengths and weaknesses. When you start trying to compare powered and unpowered sharpening, it's difficult to keep things even across the board. The WEPS is very, very easy to use, and very difficult to do significant damage to the blade with. If a perfect edge is your goal, and you have plenty of time, the Wicked Edge or the EdgePro is the way to go. If you want a great working edge (by that, I mean easily push-cutting telephone book paper, etc, but probably not good enough for a HHT) then the powered system is the way to go. I do probably five or six times the number of knives on the belt grinder than I do on all of my other systems combined. It's fast, it's easy and it's versatile. However, if you're not careful that same speed and power can come back and bite you in the form of a blade that's missing tips or has a weird recurve where you got a little enthusiastic.
More or less whatever you choose, pick up a couple cheap kitchen knives and spend some time playing with it before you try a decent blade!