I use Chrome, Firefox and Opera.

Chrome for heavy browsing.
Firefox for quick or light browsing.
Opera for the VPN, whenever needed.

For me:

On my desktop, Chromium.

On my laptop, Lynx. (Being able to browse the web without Xorg or a mouse is handy on a laptop, where mouse controls are not comfortable to use. Also, no Javascript or video prevents the more annoying adds from running, so I don't need an ad-blocker.)

On my phone, Fennec F-Droid (basically Firefox mobile with the proprietary bits removed (so no viewing of DRM-encumbered media)). (Using this rather than the stock browser means I can use an ad blocker.)

On my laptop, I have kept the "remember password / don't log out" option for three different Google/Gmail acounts that I use for different purposes, one on each browser: Firefox, Chrome and Edge.

For non-Google account things, I use Firefox as it seems the most reliable one. I used to avoid it because in a previous computer it took ages to start and do anything in general, a lot more than the mocked Internet Explorer (never discovered why). IE worked decently at the time.

At work we are "forced" to use Internet Explorer but even the IT guys sometimes surrender and confess that some of the internal applications won't work unless you use Firefox, which is installed in some computers.

On my phone I use the Samsung Internet app or Chrome.

I used to love Opera in the mid-2000s and was my main browser, but for some reason after a computer replacement I never got to install it again. I don't know what's its current state.

Pale Moon, Firefox Quantum, Opera, Firefox ESR.

Mostly Opera.

Currently there's no browser I really like or trust, unfortunately, but I've settled with FireFox for now. At least it has some good plugins.

I also have PaleMoon and Vivaldi as backups.

The problem with Brave is that it's javascript blocking options are rubbish and both it and Firefox were proven to be able to screw around without your consent.

Mostly only Pale Moon.
(I've never seen so many users of it anywhere other than PM's forum!)

TOR for special occasions and backup.
I'm thinking of adding Brave or Dissenter as well, but have heard some negative rumors about them.

I will Never use Edge, Chrome or Firefox again.

Firefox.

I don't trust Google to know absolutely everything I do.

I use Chrome because of the builtin bookmarks,Extensions sync it has via the Google account system which is very handy for users who have more than 1 PC that has Chrome installed on it. Yeah i know Firefox has a feature like this but chromes version is more convenient because of it being tied to the Google Account system.

I used to use FireFox a lot because of the extensions for YouTube Video downloaders and I still do.

Opera is my favorite. Has VPN, reasonably fast and easy to use. I also use Firefox and Chrome.

Qutebrowser
Keyboard driven, minimalistic interface, can do neat shit like piping videos directly into a local media player with the touch of a button.

Firefox if I need to selectively allow js and can't be arsed doing it without a GUI.

I use chrome as my desktop has been slowing down maybe 4 years into its 5.5 years of service. I prefer explorer since I can manage my favourites easier sorting links alphabetically or by when I added it as well as the many ways to view tiles, icons, list or with details.

Thinking of getting a new desktop and then going back to explorer.

Firefox because it's the best compromise I could find between privacy and functionality. It's a pain in the bum that they seem to keep updating things that don't need it and taking options away from the users though.