Judged by the quality and the diversity, my pitiful Jedly. Also note that not all powers would be super useful.

For example, you're an Aspect of my Knight of the Sun, Gawain. However, the Xeno you inherit from him is his knowledge of medicine, not his badass fighting skills or his super-hax sword. So yeah, you're gonna be good at making herbal medicines...and that's pretty much it.