UE4 versus Worldviz question

[Vaquero]

For a modeler (like myself) UE4 is much more intuitive, especially if you just want to create something that people can take a look at. Vizard is absolutely Python based, so placing nodes (objects, lights etc.) in the virtual environment for visual style is very cumbersome. And if you have little programming knowledge, you're probably better off with UE4's visual scripting nodes.
If you had lots of peripherals, like full body motion capture or so, than I'd say go with vizard. Or use VRPN in Unreal through the OSVR integration, but at the moment you'd then have to code a little in C++, I think.
So, if you want high visual quality and only have a HTC Vive, you may take a look at UE or Unity.
Worldviz has recently announced that they're developing plugins for Unreal and Unity, so you may get something from both worlds.