|What comparison are you asking for?|
They're two different devices.
I reread your initial post again, and if you want to replace the n1 with a modem router because of additional usb ports, I wouldn't.
No harm in trying though... you have nothing to lose. If it doesn't work you can just change them back.
High speed ethernet vs gigabit, you probably won't notice a difference. Streaming media can in most cases easily keep up with the former. Large file transfers between workstations, yeah worth consideration.
message edited by btk1w1