Mac vs. PC debates are not allowed on this forum. But, debates on accuracy in reporting are. Avid is the NLE leader as far as dedicated systems, but "desktop" NLE is another category entirely. It refers to software or software + hardware packages installed on personal computers. Avid's entry, "Avid Express Pro", is hardly the industry leader in this class! An indicator of industry leadership is market share. The latest survey I've seen shows Premiere at 18%, Vegas Video at 13% and FCP at 10%.
As for a comparison of the top DESKTOP NLEs including Premiere Pro, here's a comprehensive review that shows the position of FCP compared to the latest breed of PC NLEs
NLE Comparitive Review.
As you may be able to discern, FCP is hardly 'top dog' - certainly not the only 'professional video editor' and is not demonstrating a '20 billion times' advantage over Premiere Pro. However, if you are limited to strictly Apple solutions, then you don't have much of a choice, unless you upgrade to PC, you wouldn't even be able to compare the latest Premiere Pro with FCP. Current PC users however, would gain nothing from switching to a computer system with so small a market share, when the best examples of current NLE software runs only on PC.