Well, AE, being the newer version, has higher resale value.
I do not have these lenses in front of me but I can help you with the difference in blades. Look at the shape of the opening of the aperture in different fnos, the pattern of the shape is the pattern of the bokeh at different fnos. It is matter of subjective taste rather than a difference in performance.
I would get the MM for the cheap price because I never use Tv and P mode in my camera (not even Av for myself). Unless you use those modes a lot, you should get the AE.