oh boy.
Well, I’m reminded of these recent threads:
https://discuss.privacyguides.net/t/which-mobile-operating-system-are-you-using/
https://discuss.privacyguides.net/t/iphone-is-not-private/
Android does have a sandbox. I believe it’s probably a bit stronger, but others can chime in on how stronger and why. I imagine the addition of user profiles and a work profile as well as apps being isolated.
tldr: For stock? The one you personally like the most. At some risk, I’ll state I’m of the mindset to not introduce an extra vendor when it’s not needed. If I had to run a stock mobile OS it would either be an iPhone 15 for USB-C or a stock Pixel. I would not consider a 3rd party Android device and introduce another link in the chain. My concerns might be unfounded, but just giving an opinion. 