[arethuza]

I don't think anyone doubts that for things like OS kernels, database engines, web frameworks, browsers, libraries, editors etc. FOSS software easily wins.

But for end-user applications where you pay for the competition and where the typical end-users are not developers, or similar, (e.g. MS Office, PaintShop, most games) then FOSS versions seem rather poor by comparison.

[atesting]

Have you ever tried MyPaint?

IMO a good example of a software which does its tasks very well (I'm no (digital) painter, but I've heard about graphic artists seriously thinking about switching to it... if it only had a Mac version...).