After trying a couple of Android games the only one I use now is a SNES emulator with Sensible Soccer which is about 20 years old now but I still love it :D
I'v voted Android 4.x but its actually Cyanogenmod 10.2 (which i believe is Jelly Bean based)
This only works for later Android versions.
I'm on Cyanogenmod 11 Nightly (4.4.2)
Samsung Galaxy S4 Mini - 4.2.2 (Work)
Samsung Galaxy S2 - 4.1.2 (Personal)
iPhone 5 - ios7
Sent from my iPhone using EduGeek
Phone: HTC One
OS: Jelly Bean 4.3
switched from Android to W8 mobile, not bad but no where as good, luckily i have the tegra note.
I may look at WP as my next phone, but we shall see for now.
Android 4.4.2 Galaxy S3
Android 4.4.2 Samsung Note 3
iOS 8 (beta 2)
Phone - Nexus 5
OS - Android 4.4.3
Current version of iOS on my iPhone 4s and iPad 2 and I also have a Sony Xperia SP (which sadly doesn't see much use these days...) which is running Jelly Bean (not sure which version though).