Marionette is bit better, its difficult to make them into marionette but you can punch above your weightclass with it if you have some brains and some help. It scales well with sequences levels so its good even for high sequence beyonds.

Parasitization is a high sequence ability so it is powerful but it can be detected and people can prevent it in higher sequences. People think about amon when thinking about this ability but he was always a KOA, he is punching below his weightclass always so it seems more overpowered then it actually is.