It makes sense comparing BenQ TH671ST vs BenQ HT1075 because they both are able to give some premium features. Based on our rating, both projectors have the same overall rating of 7.3.
Advantages BenQ TH671ST over BenQ HT1075
Bigger projection screen size: 30-300 inch vs 40-235 inch
Better brightness: 3000 vs 2200 lumens
Longer lamp life (normal mode): 4000 vs 3500 hours