I've used Prismacolor Premier exclusively in the past, but they break too much and slowed down my illustration work, so based on recommendations, I now use Prismacolor mixed with Faber-Castell Polychromos. Polychromos don't break and have their lightfast rating printed on each pencil using a series of stars so you know right away, no chart needed. I only use Prismacolor when I need a certain color I can't find in Polychromos.
Shout-out to other colored pencil / pencil crayon / coloured pencil artists on the forum! Excited to see others using a medium I actually know. Karen Hull was mentioned, and she is one of my icons and role models! She does excellent work in children's books, portraits, animals, experimenting with non-paper drawing surfaces.