I have both Canon and Epson wide formats. The Canons are not as well made as Epson (lots of plastic) and I really have the feeling they wont last as long term, but its just a feeling, who knows, it may well out live the Epson.
1: Canons do not clog. Epson's do. This is the main reason why I own an 8300 as well as my Epson's.
2: Canon has less mature software than Epson, but are catching up fast and have some features Epson lack.
3: Epson has far wider user base which means ink carts can be found on eBay, and save a lot of $.
4: More ink channels (12vs 8 or whatever) means more cost when it comes to buying carts, and almost no real world gamut difference.
5: Canon support good, but I've had some frustrating issue still awaiting resolution
6: Epson support good, but I've had some frustrating issue still awaiting resolution...
7: Both make superb prints hard to tell apart, once machines are properly adjusted
8: Epson has straight paper path better for thick awkward materials, but... its of no use to me personally.
9: Canon media seems a little cheaper than Epson for same thing.
10: Canons do not clog.