Comment 22 for bug 1476705

pdftocairo is limited by the fact that cairo only handles sRGB.

It is therefore unsuitable any time color is important, eg if the pdf uses cmyk or named colors or icc profiles, et cetera.

It is fine for printing most web pages, since the browser likely also is limited to sRGB.

And for simple personal or office documents, all momochrome document and the like.

But pdftops is better for more general documents, and therefore makes better sence for the default filter.