It makes sense comparing VAVA 4K vs ViewSonic PX747-4K because they both are able to give some premium features. Based on our rating, 4K has a total rating of 9 out of 10 versus 7.3 for PX747-4K.
Advantages VAVA 4K over ViewSonic PX747-4K
Better brightness: 6000 vs 3500 lumens
3D support
Wireless connection enabled
Longer lamp life (normal mode): 25000 vs 4000 hours
More HDMI connectors: 3 vs 2
Stereo sound vs mono from integrated speakers
Advantages ViewSonic PX747-4K over VAVA 4K
Bigger projection screen size: 60-200 inch vs 80-150 inch