HTC Nexus 9 vs Nvidia shield...help!

Hey all!

I'm looking to get either:
HTC Nexus 9


Or Nvidia Shield K1

(Pictures taken from Android Authority, hope you don't mind )

Here's what I require in a tablet:
-Vainglory, and other games if available
-Movies!
-Note taking, emails and other official stuff....

HTC Nexus 9 vs Nvidia shield...help!

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