Are Vegito and Gogeta canon? http://fictionalomniverse.forumotion.com/t845-vegito-vs-gogeta

This post basically stated
Vegito is 100% Canon and that Gogeta is semi-canon?
Vegito is canon because he exists in the Manga (main canon of Dragon Ball). Gogeta doesn't exist in the Manga and only exists in the Anime and Movies which are considered alternate versions of Dragon Ball from the Manga therefore not canon.