Shield Tablet K1 vs Lenovo Yoga 2 8'' Windows

I'm looking for a tablet and I need help deciding between those two.

I need it for watching movies, listening to music (on my headphones), browsing the web and playing some games (Fallout Shelter, This War of Mine, etc.).

Which one of them would run smoother and be more future- proof? Would they both last for around 6 hours without charging?

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