Profiles and extensions, mostly. It's very easy to use and switch between profiles on Chrome. Firefox is not as good here, but at least they have container tab

Profiles and extensions, mostly. It's very easy to use and switch between profiles on Chrome. Firefox is not as good here, but at least they have container tabs. Regarding extensions, it's not only the number of extensions available, but what they're capable of doing and the process of discovering them. Sure, you can buy some extension to block ads, but it's still not as capable as the free and open source uBlock Origin. You can hide cookies popups, but probably not auto click the "deny" button like some extensions do. Safari is also a bit too simple for me. I like things that "just work", but also have some control over things. Chrome offers a good compromise, I think. Firefox gives you more power, but their UI isn't as polished as Chrome. I like Safari's power usage but since I got a M1 MBP, I don't worry about the battery life that much anymore, so the higher drain from Chrome/Firefox doesn't affect me.