In my case the inkset would match my p9000 and as Keith mentioned, the build is more robust and it has a true roll feed with cutter. Fairly simple to switch from single sheet feed from the top to roll, to a stack of sheets in the bottom.
Although for me the p800 would be more than enough since I can do rolls on my p9000, so to be honest it's partially about being a dealer and getting to know the printer so I can advise and help customers. My usage would be light, so I would certainly discover fairly quickly if they've improved the clogging situation.