It took me a few weeks to read Authority whereas I got through Annihilation very quickly. In retrospect I would've enjoyed this more if I read it quicker and got more immersed in it as a result. I did enjoy Annihilation more, for the most part. Much of Authority involved spending time with the unlikeable Control with a growing sense of things not being quite right. It's interesting, weirdly bureaucratic and the ending is excellent. Definitely going to read Acceptance now.