It makes sense comparing Optoma ML750 vs ViewSonic M1 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 5.3 for M1.
Advantages Optoma ML750 over ViewSonic M1
Better brightness: 700 vs 250 lumens
Lower noise level, 30 dB vs 32 dB
3D support
Advantages ViewSonic M1 over Optoma ML750
Bigger projection screen size: 24-100 inch vs 17-100 inch