The ViewSonic PA503S vs BenQ TH671ST comparison proves that these projectors have many common features. Based on our rating, PA503S has a total rating of 5.6 out of 10 versus 7.3 for TH671ST.
Advantages ViewSonic PA503S over BenQ TH671ST
Better brightness: 3600 vs 3000 lumens
Lower power consumption, 260 W vs 355 W
Longer lamp life (normal mode): 5000 vs 4000 hours