It makes sense comparing Optoma GT1080Darbee 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 Optoma GT1080Darbee over Nebula Mars II
Bigger projection screen size: 45-303 inch vs 30-150 inch
Better brightness: 3000 vs 300 lumens
Lower noise level, 30 dB vs 32 dB
3D support
More HDMI connectors: 2 vs 1
Advantages Nebula Mars II over Optoma GT1080Darbee
Lower power consumption, 57 W vs 262 W
Wireless connection enabled
Longer lamp life (normal mode): 30000 vs 5000 hours