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Upgrade to 10. It'll run fine on those devices (actually runs fine on the iPhone 5/5C, which is the contemporary of the iPad 4) and you'll still get all the latest security updates. if you want to hold off because of waiting on bug fixes, and ironing out any early-adopter issues, that's fine, but 10 has been a pretty stable release so far.
 
I upgraded my air 2 to 10. It runs fine, probably about the same. But most of the changes in 10 aren't clear upgrades over 9 - they're more like personal preference. So take a look at a device running 10 and see if you like it. I've kept my phone on 9 and have no plans to upgrade because I like 9 better.
 
I prefer to wait untill the final edition of a particular iOS version before I upgrade. If I still have any doubts that that version will ruin a smooth experience, I won't upgrade at all. I currently have a 3 still on 7.1.2, two Mini's 2 and an Air 2 on 9.3.5. IOS 9.3.5 works really great on our devices, absolutely smooth. I skipped iOS 8 because all the bad reviews. I was planning to upgrade my 3 (school of my eldest son required an Air 2 and one of the mini's is his too) but I'm holding off untill Apple upps the ram. If you don't need iOS 10 for some apps I'd wait. You can upgrade untill september 2017 but you can't downgrade once you do.
 
I've just updated my Air 2 to v10.0.2 and so far I like it. It is as smooth as v9.3.5 and I'm already enjoying the added features of the new OS.
 
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I prefer to wait untill the final edition of a particular iOS version before I upgrade. If I still have any doubts that that version will ruin a smooth experience, I won't upgrade at all. I currently have a 3 still on 7.1.2, two Mini's 2 and an Air 2 on 9.3.5. IOS 9.3.5 works really great on our devices, absolutely smooth. I skipped iOS 8 because all the bad reviews. I was planning to upgrade my 3 (school of my eldest son required an Air 2 and one of the mini's is his too) but I'm holding off untill Apple upps the ram. If you don't need iOS 10 for some apps I'd wait. You can upgrade untill september 2017 but you can't downgrade once you do.
I'm going to do the same thing with my Air 2 it's 9.3.5 until the final release of 10. I know it's smooth but I don't want to continually deal with updating
 
Upgrading iOS on a device is always an unpredictable event. For many, updating will be fine. For others, a problem. Even when updating the same generation/capacity device.

Having said that, I think it is "safe" to upgrade the Air 2 to iOS 10. The primary reason being that the 9.7 iPad Pro has only 2 GB RAM and was released this year so Apple won't/shouldn't be too aggressive in pushing the need for RAM. I upgraded my 12.9 iPP and it went well, iOS 10 is nice on it. I upgraded my wife's Air 2 to 10... it went well and performs just as well as it has always done.

I would advise caution (caution, I'm not advising against it) when upgrading any device with less than 2GB RAM.
 
I see no issues here with iOS 10 on our iPad Air 1 3G, iPad Air 2 Wifi, and iPad Air 2 4G.

The iPad Air 1 is a bit slower than the iPad Air 2, but that was already the case under iOS 9, so no real difference there.

YMMV but I prefer to upgrade if the device is supported.
 
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My Air 2 was running fine on 10.0 but now in 10.0.2 I'm having some problems on YouTube app playing videos (choppy not smooth as before)
 
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My Air 2 will be staying on 9.3.5 for the rest of it's life. It's stable and problem free. All my apps are fast and responsive. I plan on keeping this iPad for many years so I'd rather not slow it down.

Pretty sure iOS 10 is faster than iOS 9 on almost any eligible Apple device. Anandtech already did an article on the much smoother animations. It is buggy at the moment, but performance should not be a reason to not upgrade.
 
Did you update your app? There was a recent update to "make it fully iOS 10 compatible"
Yes I did update it to 10.0.2. I'm using Air 2 btw. Apps keeps crashing so I downgraded it to 9.3.5. I rely heavily on apps like PDF readers for my studies.

edit: Yes I updated my app. It still keeps crashing and it's getting frustrating, hence the downgrade to iOS 9.3.5
 
Yes I did update it to 10.0.2. I'm using Air 2 btw. Apps keeps crashing so I downgraded it to 9.3.5. I rely heavily on apps like PDF readers for my studies.

edit: Yes I updated my app. It still keeps crashing and it's getting frustrating, hence the downgrade to iOS 9.3.5
This stuff is why I'm staying on iOS 9 until the very last version of 10 is released next fall. Then I can do a clean restore and have a nice experience
 
Yes I did update it to 10.0.2. I'm using Air 2 btw. Apps keeps crashing so I downgraded it to 9.3.5. I rely heavily on apps like PDF readers for my studies.

edit: Yes I updated my app. It still keeps crashing and it's getting frustrating, hence the downgrade to iOS 9.3.5

Strange. I'm running 10.0.2 on my Air 2 and using Documents 5 for PDFs without a problem.
 
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