"SelfControl" and "Flux" are really good for productivity, SelfControl helps to block the unnecessary websites, and there's literally no way, absolutely no way to access those websites, unless of course you turn on a VPN, Flux on the other hand uses circadian rhythm and the location of the device to determine the colour temp of the screen, really beneficial for sleep cycle

Safari for opening links and stuff, though I don't use a separate browser in my phone, the built-in Google search browser seems better, which is not Chrome fyi