Behind on what? Best performing CPU/GPU, best battery life, best camera/video, only one with good biometrics, best integration of thier other devices, best rated screen, slimmest at this size, most good apps (including most top end apps), a whole suite of free productivity apps. IOS 8 has mostly feature parity with Android and exceeds in several areas, includng how smooth it runs (Android still not up to par despite 4+ cores and more memory)..
Behind on times, along with everything else. iOS is an aged operating system, and in my opinion it's really simplistic and old-fashioned compared to Android.
As a phone operating system, iOS is fairly crappy: while Android has a better dialer, better contacts management, better call log, better notifications, better messaging etc. As a smartphone, Android has better email, a better web browser, better voice recognition, better mobile data management, better multitasking, and excellent integration of Google services, in particular Search and Google Now (which is incredibly well implemented, useful and far slicker than anything Apple has). Generally, when you see how well apps cooperate and how easy is to do stuff in Android, you cannot believe how archaic and awkward is Apple's closed system.
Look at how Apple is trying to catch up with Android features: they advertise now, with much fanfare and self-back-slapping, that Siri has Shazam integration. Google Search had music (and film, actually) sound recognition for more than a year now, on Android. It just was there, among the zillion other features it has that the Apple iOS doesn't.
And yes, Android is perfectly smooth (even on my old Nexus 4, but you should see the now year-old Nexus 5). It's stuff like TouchWiz that seems to be half-baked. Productivity apps are not lacking either, or any other apps for that matter.
The thing is, if you'd remove every Google application from iOS, it wouldn't be an just old fashioned icon grid, but a largely useless one.
Apple is pretty good at making lifestyle (read: fashion) tech. Like B&O for example. They integrate other people's technology and sell essentially a very pretty (except for the iPhone 6es, which look like ugly Nokias to me) but essentially inferior products for a premium price.
Anyway, back on topic - the Nexus 9 looks fantastic. I'm really glad they filled the 4:3 aspect ratio, ~9" size tablet spot. If only they had released it last year...