It makes sense comparing ViewSonic PA503X vs Optoma HD131Xe because they both are able to give some premium features. Based on our rating, both projectors have the same overall rating of 6.6.
Advantages ViewSonic PA503X over Optoma HD131Xe
Better brightness: 3600 vs 2500 lumens
Lower power consumption, 260 W vs 262 W
Longer lamp life (normal mode): 5000 vs 3500 hours
Advantages Optoma HD131Xe over ViewSonic PA503X
Bigger projection screen size: 38-301 inch vs 30-300 inch