Use whatever you want. But do consider if you want to contribute to Google's monopoly, and if you want to use an open-source browser.
- Vivaldi Browser is not open source. Better use Brave than that…
- If you still really hate Firefox, Ungoogled Chromium which is basically Chrome with all the Google stuff removed.
- All of the above do still contribute to Google's monopoly, so I would really encourage Firefox or a fork.
- Barring that, you could also get away with a WebKit browser (like GNOME web, Nyxt). Although WebKit is developed by Apple, it's still open source and doesn't look particularly bad. If you're on a Mac, Safari is an option, but it's closed source.