both produce outstanding work, and while perhaps some subtle difference may be observed upon very close examination on prints side by side, they really are insignificant.
In five years with a canon, based on your feedback on the Epson and clearing clogs, you easily could require two sets of new heads. There is no free lunch with either printer. (and then you might luck out and only have to replace them once). But it seems 18-30 months is normal for head life on the Canons.
to me the Epson wins big on paper handling, both sheet and roll feed. The canon wins big on ink swapping (which I don’t ever do so one reason that’s not big for me). The canon also wins big in the fact that it manages the nozzle clogs without any real user intervention which can save user time. But it’s not without it’s own concerns, after about 18 months you better have spare heads on hand because you never know when they will suddenly need replaced. And while many claim they’ve never had a problem mid print, it has happened to me with a canon and I’ve seen it mentioned by others as well.
But as far as TCO, everyone assumes the Canon wins because it doesn’t “clog”, which isn’t true, and the cost of 4 new heads over 5 years would buy a lot of ink.
with either printer, if you want to keep the clogs under control (so less ink to clear clogs on the epson, longer head life on the Canons), keep them in a 45% humid environment. I have a 4 year old 9900, not used that often (will sit weeks without being turned on). I still have the original maintenance cartridges in.
but again back to your original question, I don’t believe the Canon print quality would disappoint at all compared to your 9900. (if you stay with Epson, I think the 9890 would be something to consider as well).