This is me for the most part as well, using my iOS 7+ as my primary work device and my S8+ as my personal device. I don't even put my personal email on my iOS devices any longer. Much of this was driven by past business behavior of being able to keep my work/private files segregated, both for tax and legal purposes.
But having said that, I do primarily use my Android device as my telephone number for incoming calls. I just have my iPhone setup to call forward to my Android phone. I tried the Google voice thing for a couple of years and it worked well but I wasn't willing to port my 15 year old number from my iPhone to Google voice.
Too bad you can't easily spoof your Caller ID on each call or I'd use my Android phone for all outbound calls as well.