Window 7 vs Apple Snow Leopard

I have to really agree about the 'colourful spinning beachball' as a great annoyance for the Snow Leopard OS. Very very irritating. Is this more of a bug of Snow Leopard, or is more memory needed? My Firefox on Mac always freezes and show the spinning beachball.

Hope this well change. This is giving me doubts about Mac OS being the better operating system.