Hi,
I was in a similar position last year and was deliberating between the EPSON SC P7000 and the Canon iPF Pro 2000. Finally I bought the EPSON SC P7000 in October 2016.
So far no clogging and it has been idle a few times up to 4 weeks and no problem. I used to have the old EPSON Stylus PRO 7500 and that one has been idle sometimes for 6 months and after 2-3 normal cleaning cycles no clogged nozzles at all.
About size, OK yes the Canon is 10" narrower
but anyhow getting such a 24" printer needs space so 10" more or less, I would say, makes not a big difference.
My main reason buying the EPSON SC P7000 was not based on clogging or not clogging but more on reliability of after sales service and ehre in Mexico the fact is EPSON is by far much better the Canon.