I use Safari and Arc because they’re both innovative in ways that’s not matched by open source counterparts.
I tried ditching Arc for Zen, but it just doesn’t have the same level of polish. It feels like a copycat, which it is. I hope it gets better with time so that I can switch to it some day but it’s not there yet. They should be able to match Arc though since it’s development is stopped.
I use Safari because it syncs well between macOS and iOS and I like how Apple has been experimenting with it for the past years (since iOS 21 iirc). They try new stuff with the UI and it works for me.