Best Tablet for Mobile Gaming Questions (?)

Guys, right now, what's the best tablet out there for mobile gaming in the entire tablet industry (non Windows)?

The best tablet/phone optimized for mobile gaming as well? (like Modern Combat 4, etc.)

What's the tablet that has the best GPU? (I know Tegra 4 is around the corner but I only want to know what's out now)

What are synthetic benchmarks?

What's the opposite of synthetic benchmarks?

Are these synthetic benchmarks?

GFXBench 2.7 T-Rex HD C24Z16 - Offscreen (1080p):

GFXBench 2.7 T-Rex HD C24Z16 - Onscreen:

GFXBench 2.7 T-Rex HD Fixed Timestep - Onscreen:

Is pretty reliable?

Thanks in adv!