I use Edge as a third option browser.
Mainly use FireFox
Secondary is Google Chrome
Opera used to be my third browser but I dont use it anymore, prefer Edge over it especially since Edge uses Chromium's code.
IE is just a last alternative in case if I ever need it but Edge looks like it'll replace that spot especially since IE is going away next year and Edge is going to become the next default Windows browser going forward.
I've never used Opera before, so I might give it a go to see how it fairs.
I had to use IE(old ass version too) for a certain application at worked because it wouldn't work on any other browser. It was awful and dumb. We now use an updated version of it, which can be used on other browsers.