What I have learned, having small hands, is that the Armi San Paolo / Euroarms are based on the Remington-Beals Elliot Model (referred to as Old Army), and not a true 1858. These are the smallest framed Remy's made.
This is the ones I prefer.
THE Uberti 1858 is a bigger frame than the aforementioned guns and based on the true 1858.
Pietta is the biggest framed 1858 and based on a true 1858. With small hands I find this frame too unwieldy.
Hope this helps.