I'm rather fond of Kontakt after working with it for years, and I've never had it fail me when I needed it. EastWest's Play has improved so much in the last 4 years that it runs almost as well as Kontakt does, at least for me.
VB3 is totally awesome, and the NI organs are really good as well. Someday, I may have to try a UVi product, but I think I'm good for now.
Regards,
Dan