The Pietenpol is an interesting build and a nice scale plane, but the mini scout is easier to build and flies better, in my opinion. While both can likely be altered to use alierons (linked to a single central servo), the mini scout is easier to do this with, should you be so inclined.
As a trainer aircraft, however, the Pietenpol would win. It has tamer characteristics and is pretty good at self stabilizing.
Of the two, though, the mini scout lived longer in my hanger.