It makes sense comparing Optoma ML750 vs ViewSonic PX747-4K because they both are able to give some premium features. Based on our rating, ML750 has a total rating of 5.6 out of 10 versus 7.3 for PX747-4K.
Advantages Optoma ML750 over ViewSonic PX747-4K
Lower power consumption, 62 W vs 310 W
3D support
Advantages ViewSonic PX747-4K over Optoma ML750
Bring the cinematic 4K UHD experience home with the PX747-4K
Bigger projection screen size: 60-200 inch vs 17-100 inch