What's the preferred renderer to use with Wings3D these days?

[ekolis]

So I know we have plugins for Povray and Kerkythea and maybe Yafaray, but which one is the best supported with the most features? Povray won't render transparent backgrounds, and Kerkythea doesn't seem to have that much in the way of options for materials, and I don't even know if Yafaray is available outside of a Blender plugin these days...