Have you seen this thread - MINI- PUTV 3D Models Showcase Progress & Tips - #100 by PopUpTheVolume - @PUTV has some great scans and comparisons going on there that may help you also! I am also an original POP 1 backer (who hasnt had the time or patience to really even mess with it sigh) and from what I can gather the mini does really nicely for the finer details (actually I think Pop says that exact same thing in t hat thread lol) and the 1 and 2 are more of a general scanner for the basic shape.
I hope that helps you at least a little ! Have fun scanning and making 
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