We had a chance to test and compare two models: VAVA 4K vs Optoma UHD50 and this review should help people who are looking for a good projector. Based on our rating, 4K has a total rating of 9 out of 10 versus 8.6 for UHD50.
Advantages VAVA 4K over Optoma UHD50
Better brightness: 6000 vs 2400 lumens
Wireless connection enabled
Longer lamp life (normal mode): 25000 vs 4000 hours
More HDMI connectors: 3 vs 2
Advantages Optoma UHD50 over VAVA 4K
Bigger projection screen size: 34-302 inch vs 80-150 inch