On the two PC’s, we use three browsers regularly – Mozilla Firefox, Chrome, Microsoft Edge.
My preference is Firefox, not the least because it is open source. I’ve always been a fan of open source as a concept and try to support software that continues in that vein. Another reason is it is less a resource hog than Chrome. If one uses a browser while gaming (I often do with Minecraft), a smaller program is helpful to keeping computing power focused on the game.
For years Chrome was my preference, but as it has grown in size and complexity, I like it less. My wife is used to it, so that is set as the default browser on the desktop.
Microsoft Edge has one advantage – it is generally faster than other browsers. However, the way I use bookmarks, it is woefully inadequate for folders, sub-folders, etc. I use it relatively rarely on both machines, but sometimes it is useful.
The first browser I ever used was Mosaic. Then soon after, Netscape and Internet Explorer were the best options. I always preferred Netscape back then. Over the years I used several others, including Opera, Pale Moon, and the SeaMonkey suite, but eventually settled on Chrome and Firefox.
I should note on the iPad, I’ve used Safari (don’t like it), Chrome, and Mercury. I very much prefer Mercury, so use that almost exclusively now.