I'l rather pay more for a fluid performance and vast range of tablet-optimised apps than paying less and working on a laggy tablet, which is always ready to heat up.
Apple IPad Air 2 will be more good. Runs on iOS 8. Never stops whereas nexus 9 runs on android so stops in between. Nexus 9 sometimes heats up but iPad air 2 never heats up under heavy workloads also.you should definitely go for iPad air 2
IPAD AIR 2 no other Choice ...Nexus is good but tablets are APPLE dept. and even I am planning to buy one.. I know they are pricey but they are much more futureproof Galaxy Tab S is my choice if Android ..
ipad air 2 must be better because ios is completely lagfree but android tablets still lags you can see this by benchmarks also in which apple ipad air 2 scores maximum!
Truer words have never been spoken, I guess. Google has pretty much given up on tablets, instead focusing on the "phablet" space. With the Nexus 6 and similar big phones getting so much better every year, I don't see why anyone would want to go for an Android tablet.