For your safety, I hope the government looks out for you. Because nobody else is going to do your due diligence, evidently not even yourself.
I'm genuinely all ears, because this has not been my observation, but I've never done and in-depth study of the matter.
- Android is Open Source. Google itself is a ghoulish company nowadays, few people are wrong in assuming that. For all of iOS' security taglines though, you can't build it yourself and create a further-hardened version. "Features" like Apple routing traffic around your VPN cannot be un-programmed. This doesn't necessarily make Android a better OS, but it absolutely enables better overall privacy and proves that a better ideal is realistic. I don't personally hold Google in high regards security-wise, but the AOSP has nothing to hide. You can go see for yourself.
- Apple's software can't be trusted. pbourke's correct in that consumers have to make a choice about trust when selecting hardware, but I see no evidence that Apple's approach is working. Their services turn over personally-identifying data to governments by the ten-thousands, and in countries like China your iCloud server lives in a CCP-owned facility. Apple does nothing to resist obvious government censorship ploys, and is indeed a decade-old member of America's PRISM program. Without any transparency holding Apple accountable, you really have to hold on the question - can you trust them?
- Neither Google nor Apple make good OSes, in part because neither one is motivated to compete with the other. Google treats Android as a technology dumping ground and a defacto unifying platform for their various hairbrained hardware endeavors. Apple treats iOS like Hotel California. Both companies have found a niche in ignoring each other, and Apple has used it as an excuse to pursue business strategies Google could never dream of. It's a threat to the market no matter how either of us feel about it.
The DOJ put it best, this morning: "Apple deploys privacy and security justifications as an elastic shield that can stretch or contract to serve Apple’s financial and business interests."