Just popped in from lurking to clarify from the Ventuz non-religious “we like everyone” standpoint…
VVVV and Ventuz are, though in some ways similar, very different toolsets. They have similar concepts in them (they are both non-linear, DirectX realtime 3D authoring frameworks) which can make it easy to assume they are competitors, but in reality they have fundamentally different approaches, use cases and philosophies and are more often used together than in a mutually exclusive way.
VVVV can do many things that Ventuz cannot, and Ventuz does a bunch of things much better then VVVV.
To give a pro and counter example, Ventuz is quite extensively used in Broadcast Television, so it has a very, very robust and powerful live video and videoclip architecture, but it is currently not set up for doing procedural generative content.
Use a hammer to hammer nails, use a screwdriver to put in screws. :)
&thanks u7angel for posting the new documentation - that other link was from several years ago…