I used Linux a lot in the late 90s/early 00s because I was contributing to a few open source projects, and then I always used Konqueror because it was so much faster than the alternatives (the rendering engine was used as the basis for the first versions of Safari in 2003).
Before that, I used Mosaic in the early days of the web, then Netscape.
Nowadays, I just stick with Safari as it is so well integrated into the OS. I am not a big user of extensions (except 1Blocker, 1Password, Downie and DevonTHINK), so I see no reason to use other browsers, except for testing web pages under development.