As an owner of the Sony, I'd say Sony. However, you need to be aware that there are some Sony sets out there that suffer from a colour issue, where purple/green hues are displayed instead of grey/black shades - because of this, mine is going back and will hopefully be replaced by a X3000. Saying that, I understand that there are plenty of issues with the Samsungs too.
Probably hasn't helped you much, but all I will finally say is that a non faulty W3000 has a superb picture, especially when displaying HD.