I use both operating systems so very pleased to see more google apps compatible on my iPhone.
I couldn’t use iOS if Google Apps weren’t available. I use Drive and Sheets for work all the time.
I'd have to switch from my gmail account to another email provider, which isn't difficult. I'd also have to find a new home for my YouTube content. That said, I'd still stick with iOS.
Why would you need to switch email? I don't use the Google app but can still get my Gmail. I can also watch YouTube via Safari.
Going a step further than the apps, I'm trying to imagine a Google-less experience.
Ahh ok!