I only use Safari on my personal computer. And at work I use Firefox for development, and Safari for personal stuff. I used to use Chrome but nowadays it's very rare (testing something specific).

The thing is, Chrome actually feels snappier than both Firefox and Safari when I am using it, probably because it's profile is empty (almost no extensions, no history, etc.).

I rarely see broken websites, with any browser. And usually it's because of my ad-blocking extensions. Google websites are slower on Firefox, but rumours are saying that it's almost on purpose… (one more reason to not use Google products like Chrome).