Europeans trust Sony for whatever reason... ;)
When I went to England some years back there was a heavy bias to Sony and Nintendo. I went to italy and the bias is heavily in Sony's favor. Times change but I dont think Sony has lost so much of that bias, people are just buying whatever consoles apply to them most.
People in Germany buy Playstation because it's Playstation - as easy as this. Many, many people buy stuff because they know the name, not because they researched before for hours and hours and read reviews which console might suit their taste more.