Yes, both Vectorworks Designer and IrisVR offer a Free Trial.
Vectorworks Designer is designed for and undefined.
IrisVR is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Vectorworks Designer Starts at $4,813 whereas for IrisVR Starts at $225/Month.
Some top alternatives to Vectorworks Designer includes YouBIM, Space Designer 3D, Vectorworks Architect, Vectorworks Landmark, Navisworks, Archicad, Revit LT, IrisVR, MasterSeries and Autodesk Design Review.
Some top alternatives to IrisVR includes BIMx, BIM Track, Vectorworks Architect, Vectorworks Landmark, Archicad, Revit LT, Vectorworks Designer, SENTIO VR, Enscape and bimU.io.