Key differences would be speed, it flies through a stack of photos, does a better job of scanning photographs at 600dpi and the autocorrect is also good. I’ve the older 500 scansnap so perhaps not a fair comparison, but I never was impressed by it for photographs. The Epson software offers naming and annotation and is fine. Naming and dating takes the most time but I’m sticking with doing that.
My use is towards the scanning of about ten Archive boxes filled with prints, all from a good lab and the quality from the Epson is more than appropriate for the task in hand. I’m planning on a shared Photos Library with my family members. It’ll be months of work and something I’ll throw the odd afternoon at, slowly work away at it.
Fstoppers review has samples of the autocorrect the scanner offers.