Mainly Firefox, secondarily Chrome. I left IE around 2002, IIRC, when, after cleaning up the PC after a trojan infected it, but luckily malfunctioned, I discovered that even telling IE to never save sensible data, it did it anyway and stealthily in that darn index.dat file, that back then was very unsafe too in case of malware, as it wasn't encrypted, just obfuscated. From then on I never trusted IE again, using it only for Windows Update as long as MS kept on requiring it for that task. Later for a while FF got worse, so I used mainly Chrome, but it was, and still is, a memory hog, so I had to keep a lot fewer open tabs. When FF bettered again I switched again to it as main browser. BTW, with Firefox and Thunderbird it's very easy to use the same local account with different OS'.

Edge is just a reskinned version of Chrome, so it doesn't really make much difference...

It's the browser equivalent of Xbox vs PS.... without browser exclusive websites...

I switched to Edge a few years back now after using Chrome for many years mainly due to how much memory Chrome used and the fact that Edge was the only browser that supported 1080p+ for Netflix compared to others been limited to 720p.

Firefox all the way, it's great and more people should use it IMHO.
People mentioned some sites not loading correctly (Eurogamer), but I can access that site 100% fine with no problem with FF.
I like anti-fingerprinting is built in standard, because doing that as plugin in other browsers ends up looking more unique to trackers.
Only complaint is recent update, before you could search with non-default engines by just clicking their icon, now you also must press Enter. (boohoo)

Never use Edge, I do have Chromium installed but never use it.

I left Chrome this year to go back to Firefox. Webpages started to seem to know too much about my interests.

I prefer Firefox, but have no clue why Eurogamer.net won't load anymore or why Imgur always gives me "Zoinks you have taken a wrong turn". I don't have any logins or passwords stored, the only extension is viewhance which I guess came from FF itself.

Anyway I fixed it by deleting the cookies and site data for those sites and logging in again. I was just too lazy to figure out how and used Edge for those 2.

I got a new PC recently. I use Edge and Firefox now. Previously I used Chrome for years and years. In the last few years, I used Edge as an alternate browser. I feel like I'm done with Chrome. I know browsers in general can eat up a lot of RAM, but that's why Chrome is no longer my main pick. Firefox can eat up similar amounts of RAM, if not more. But Edge is my main pick now. It uses less RAM on average than either of those two.

I still love Edge and use it exclusively on PC. It doesn't drain memory or crash like Chrome does.

Not a big jump, since both use the exact same rendering engine, chromium. Edge used to have it's own engine, until they switched in late 2018.

I'm mainly using Opera (and the gaming-centric Opera GX as a secondary browser), which is also based on chromium. It goes so far that in addition to Opera's own extensions, one can install standard chrome extensions without much fuss if there's no Opera version available.

Fun fact: The rendering engine of chromium is called blink and is a fork of webcore, one of the main components of webkit, the engine of the safari browser. As a result, all major browsers these days safe for Firefox are closely related.

Use Safari mainly. I do use Edge though on my work laptop as it is a Windows laptop.