Don't confuse the PC Plus with the Plus (as I often do). I wish the Orange Pi people would select less confusing names! The Plus (which I do no have) also uses the H3 chip, but has Gigabit ethernet and SATA.
The PC Plus does not simply add eMMC. It also adds Wifi, although I never use it and probably never will. by adding an external PHY. Both the PC and PC plus use the 10/100 PHY internal to the H3 chip.
Tom's electronics pages / [email protected]