I have found the one's with the templates to be easier to use. Just pick your button hole, drop in the template, and sew the button hole. The other button holler requires you to set all the adjustments.
So far I've done more with the later model version that uses the cams than the other one.
As far as the neatness of the button hole made, I don't think there's any real difference once you get the old one adjusted.
Oh there's one benefit to the old style one too; if you have an odd size button you can set the adjustments to fit it perfectly. Sometimes the newer templates don't match up the button exactly.
Joe