p10 came out first. with p8. use metal body.

p100 came out later, with p93 or something. plastic body.

P10, P8 series are for "higher" end market. the camara is a little bit smaller, too.

however, since p10 came out earilier, it only support usb1.1. i think p100 support usb2.0 already, (not sure though)