I use both on a daily basis, and even I have no idea why I'd pick one over the other, except for power-user functions that 96% of the world couldn't care less about. In normal use, even standard dev work, they both do what I need them to do, and I (infrequently) run into bugs for both of them.

And honestly, at this point I don't even bother opening sites that struggle in one with the other: I just go "you clearly just didn't care to develop your website to work cross browser, good job, goodbye forever" and close the tab.

For almost everything, both browsers are identical except for the veneer their UIs present. They have different quirks, but a reasonably generated website or React app will work just fine in both. So while, if someone asked me to recommend one, I would absolutely tell them to get Firefox: not one asks for recommendations... everyone's already using either Chrome, or "the ios browser".

(and safari on iOS really _is_ the new IE6. I 100% disagree with the article's claim that Apple is making good strides, there. It needs to get out the shotgun and take Safari out to the back of the barn)