I've seen some covers for these seats that have the MOTO GUZZI print on the back shaped in an arc, sort of if it were wrapping around a fender (which isn't the case for your bike). Not sure where those are coming from, but wanted to mention in case that were a detail important to you. The text is straight across (level, not arched) on the original seats. Seems to me if the print isn't done right on a repro cover, which seems to be maybe the easy part if going that far with making them, so then I wonder about the rest of the cover quality and fit... another rant, gee.. what is happening to me today??
As far as quality between the two.. Don't know - I haven't seen either one in person.
Hopefully someone who knows can pitch in.