Pixel C or Nexus 9?



I've been using the Nexus 7 (2013) for the last few years and have loved it. I'm ready to upgrade now and am trying to decide between the Pixel C and Nexus 9. I mostly use it for reading books, and light media consumption (no gaming). With the upgrade, I'm planning to do some light productivity- notes in meetings and email, so I'll be getting a keyboard either way.

Probably doesn't matter, but my phone is a 6P.

$ isn't an issue. Which should I buy (poll) and why (comments)?

Reticulating poll splines...