Re: Quality
I find the alerts are much better on Android too. The BYOD "Work" profile is also pretty good (I don't BYOM, it means you can use >1 WhatsApp number on the same phone).
Going back the other way... I do miss iMessage (or rather the people who won't use anything) and also the "Wallet" feature when on my iPhone. I find some of the nagging for reviews and photos of places on Android infuriating (until it all got turned off).