Something very worth considering for an individual artist (it's not a big deal for a shop that prints every day) is that a Canon printer can be turned on and off at will. If you print a batch, then turn the Canon off for a month, then come back to it, it'll work just fine (it'll gurgle around and do an automatic head cleaning, but I've never had one fail). They do (eventually) blow through the head, which is a 5 minute job to replace, but costs $500 or so. The heads last long enough that neither I nor a couple of Canon-printing friends have ever had to replace one. One friend did, but the printer was about 7 years old. It's still ideal to let them sit as little as possible - but they don't hurt you like Epsons always have.
Epsons above the p800 don't like being turned off - they're getting better about it, but turning an Epson off for a month has historically meant multiple nozzle checks and head cleanings. If you get a permanent clog that kills the head, changing the head requires a service call and costs $2000 or so (really only worth it if the printer is a 60" or a relatively new 44") - you can almost always get a 24" printer for less than the cost of the repair plus the ink that comes with the new printer (and a 44" isn't that much more than the repair plus the ink).
I've had both (a couple of each) and now choose Canon, because they work better in individual artists' workflows. A lot of people who print for pay, and print every day, choose Epson because they don't have consumable heads. If you print enough to keep the clogs at bay, Epson heads can last forever, while you can print a Canon head into oblivion if you print enough.
In summary:
Epson - clogs if you don't print enough, head lasts forever if it doesn't clog. If you get a clog that kills the head, it kills the machine (unless it's under warranty or a 60").
Canon - works much better than Epson for individual artists, but commercial high-volume printers can blow the head. Blowing the head is a $500 issue (worth changing head on a 24" printer).
HP (never had one) - Head is a $100 item (although there are five of them, so changing all the heads is as expensive as changing Canon's one head). Big advantage if one color goes - just change the head that has that color plus one other. Don't seem to be as popular among photographers. Heads are a "real" consumable item - what I've read about older HPs is that the head lasts a few ink cartridges.
Both Epson and Canon (and I suspect HP, too - but I've never seen either a Z9+ or a print from one) offer excellent print quality and uncomplicated media loading. Epson has a slight media advantage in that the paper path is straight. I get really thick fine art media (Canson Infinity Aquarelle) through my Canon no problem - but you can feed an Epson sheet metal!!!