Safari on my Mac. Keychain is just so useful, and whilst I also have Opera for the purposes of bamboozling streaming sites with the VPN (Netflix is on to them, but a some others aren't) I don't like the fact that it was bought out by a Chinese group.
I've started using the DuckDuckGo search app on iOS as I always just have so much saved to Pocket I never need a full-on browser. So far its quite useful although having a feed of recommended reading (mostly terrible) could do with going away.