The Canon Pixma TS7720 all-in-one printer is best suited for light-duty use in a home or home office, where it'll serve nicely despite its potentially high running cost.
The Canon Pixma TR7820 has high ink costs, but its 35-sheet ADF potentially offsets them for homes and home offices that need to scan and copy multi-page documents more often than they need to print.
The Canon Maxify GX1020 is a suitable all-in-one printer for micro offices, home offices, and personal use, but it has minimal scanning and copying capabilities.
The Canon Pixma G4270 is a good fit for a home or home office all-in-one printer if you print enough for the savings in low running cost to make up for the high initial cost.