This Instax film paper is expensive; it works out to about 90 cents per print. ... In any case, the Square Link’s print quality is very good. There are two color profile modes: ...

The Canon Selphy QX20 uses dye-sublimation printing, which requires paper and ink. ... The Selphy QX20 accepts two sizes of sticker paper: 2.7-inch square paper and 2.1 by 3.4-inch portrait paper.

That's not a big print size, but the square format lets you easily fit more in. Unfortunately, it also costs more: $17 per pack of 10 photos (£9 in the UK and AU$35 in Australia).