I should emphasize that in neither review did I make any statements about the performance of these printers in respect of clogging, because these are new products with insufficient evidence upon which to come to any conclusions about this aspect of performance. The facts we now know are confined only to HOW these printers manage maintenance to mitigate clogging. With an Epson professional printer, if you run a nozzle check and you see missing bars you launch one or more cleaning cycles to clear the nozzles. With the Canon Pro-1000, there are three approaches for this maintenance: (1) mandatory self-cleaning - beyond user control, (2) redundant nozzles in the print head and (3) manual cleaning as for the Epson. There isn't more to be said about the implications either way yet. If you are only printing a couple of times a month, bear in mind that both are pigment printers and both may need or implement cleaning when you fire them up, depending on a number of conditions.
Major difference between Canon and Epson is head technology - thermal in case of Canon, piezo in case of Epson. Thermal head nozzle is several dozens smaller and produces more pressure than piezo nozzle, where there's large membrane chamber, with lots of place where air bubbles may gather, which absorbs pressure produced by piezo membrane. Smaller size with limited potential for air bubbles to gather and ability to produce higher ink pressure makes thermal nozzle less prone to clogging.
Due to compact size of thermal nozzle the print head had has very high nozzle density (1200dpi). The Canon prints at 600dpi using only every second nozzle, so each nozzle is backed up by a spare nozzle - when clogged nozzle is detected, it is compensated by the back up nozzle in the next head pass. This completely eliminates the possibility of banding while printing.
Furthermore, when the printer is on, it's maintaining print head and agitating ink carts. I'm not sure about new iPF PRO series, but in former x300-400 there was even a silicone tray, from which the silicon was applied by wipers to the print head to keep moisture.
The combination of head design that is generally less prone to clogging, clogged nozzle compensation system, automatic print head and ink cart maintenance and the fact, that there are separate channels for MK and PK blacks results in noticeable savings of ink and time used for head maintenance, and virtually eliminates the clogging problem from our lives. All you need is to keep printer on, it will take care of itself.