I actually switched from iPhone to Android (OnePlus 3T). I've used the iPhone 6S for about 18 month, so I can give some feedback. I have AirPods too, they work very good with an Android phone.
Screen size. 4,7" is too small for me. Then again, 6S plus 5,5" is not too big but the iPhone itself is too big. Bezels and the poor screen-to-body-ratio is bad.. there are better alternatives on Android.
Oneplus 3T size: 6.01 x 2.94 x 0.29 in
iPhone 6S plus: 6.23 x 3.07 x 0.29 in
iTunes. I have a lot of music on with mp3's, and it's a nightmare to sync the music on the phone. It's slow and sometimes the covers on the albums are wrong and it's annoying to fix it. I have Spotify premium too, but not all music can be found on Spotify. With the Android, I just drag and drop the music from a folder to another folder. And done.
Taking out the pictures from iPhone. Yes I know, just plug the iPhone to a PC and PC sees the iPhone like a digital camera or sync via iCloud or something. Well, when tried to move photos from the iPhone to PC, it copied the first 10 pictures and after that iPhone stopped responding. I restarted iPhone and the PC, looked the issue from the web, no answer. So I synced the pictures to the OneDrive. It took a while, because OneDrive won't work in the background because of the iOS restrictions, so you have to have the app open or screen active.. other thing is that If I use Mac, the pictures get synced fine, but if you want to backup manually your photos, you have go to the hidden photo folder, where is the original photos and not the photos appication thumbnails.. you know what I mean.
No optical image stabilizer in the camera, only in the plus model.
iPhone 7 and forward are missing 3,5mm jack. I have devices and places where 3,5mm plug is still in use and adapters get lost easily and one more cable to worry about. So no thanks.
Last time I used Android was when the Android was on 4.4.x and then it sure was not good. Using 6.0.x and Nougat things are pretty good now. Of course it depends a lot from the manufacturer, but using Android nowadays is a lot better then before. If you don't root your device, install apk's from shady corners of the web or click every penis enlargement -ad on the web, you're totally safe. Same as using a computer, best spyware/firewall/virus control is you, between the screen and the seat.
Thing is that I can do and enjoy more doing my daily tasks with an Android phone than with an iPhone. Another thing is that OnePlus 3T is dual SIM phone. I can have my personal number and my work number in the same phone, don't need to carry two phones anymore.. this wasn't deal breaker for me.
If iPhone gets better in couple of things, I'll switch back of course.