well, i use firefox that too a fork which is mull browser developed by divestos, which is more hardened. on custom rom (fully open source android os) i have option to which app to install. so no default chrome browser for me. i don't even use default youtube app. where in apple all your browsers use same safari engine (Where's is your choice when all those different browsers are same) apple in the past had many privacy issues, like giving backdoor to FBI, when they tried to snoop into your phone gallery, but backed down when public enraged over it. when half your data stays in a centralised cloud platform. that's why people like Snowden uses an android that too running custom android os.

here's a video about how iphone isn't a privacy centric phone