Bartman - Sharpening styles and methods are as varied as hunting styles and methods, each "expert" thinking theirs is the best.
This one is just mine.
Most serrations are originally ground on one side. This produces a very thin very sharp edge. If the goal is to retain this very thin edge, then sharpening on the ground side only at the same angle as the original grind will produce the thinnest and sharpest edge. This thin edge can under hard use damage teeth because EACH TOOTH STANDS ALONE. It does not have the adjacent plain edge to help support it.
The next method would be to use something like the Sharpmaker sharpening each stroke on the ground side with every 4th or 5th stroke on the opposite side to cut off the burr. This will widen the edge angle and produce a sharp edge that is still thin, but not as thin as the first method, thus stronger.
The next method would be to simply sharpen both sides on the sharpmaker as Blades mentioned. This will still give you a razor sharp edge, but it will be ultimately stronger per tooth.
sal