opera better than firefox?

I occassionalyl download Opera to see what is new with that browser, and I know alot of somewhat security aware windows users prefer Opera over firefox, and I am sure there are plenty of Linux users who prefer Opera to Firefox. My question to all of you Opera users is simply what advantages does it have over Firefox if any? I personally don’t see any and I was hoping some Opera users could enlighten me about some of the wonders of Opera that I might be missing.