It makes sense comparing ViewSonic PA503X vs Nebula Mars II 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 Nebula Mars II
Bigger projection screen size: 30-300 inch vs 30-150 inch
Better brightness: 3600 vs 300 lumens
3D support
Advantages Nebula Mars II over ViewSonic PA503X
Lower power consumption, 57 W vs 260 W
Wireless connection enabled
Longer lamp life (normal mode): 30000 vs 5000 hours