Tarocco blood orange tree (native to Italy). Less pigmentation than the other two. This one is said to be the sweetest and most flavorful of them all. The tree is vigorous and moderately productive
Sanguinello blood orange tree (native to Spain). Orange flesh with red streaks which is sweet and tender. The fruit often matures in February, but can remain on trees until April/May. The tree is small/medium in size, spineless, and very productive.
Moro blood orange tree (thought to have originated in Sicily). It is the most colorful of them all; they can be ruby-veined to nearly black. Sweet flavor with a hint of raspberry and dense flesh. Some believe this orange is more bitter than the Tarocco or the Sanguinello. However, I have found the flavor to be variable even within a subtype. Some people have reported that the best flavor is often from fruit grown in inland valleys, perhaps from the heat. Fruit can remain on trees until April/May, but flavor declines if on the tree too long. Tree is of moderate growth/size and has a round-somewhat spreading appearance.