The LG PH550 vs BenQ TH671ST comparison proves that these projectors have many common features. Based on our rating, PH550 has a total rating of 7.6 out of 10 versus 7.3 for TH671ST.
Advantages LG PH550 over BenQ TH671ST
Lower power consumption, 60 W vs 355 W
3D support
Longer lamp life (normal mode): 30000 vs 4000 hours
Stereo sound vs mono from integrated speakers
Advantages BenQ TH671ST over LG PH550
Bigger projection screen size: 30-300 inch vs 25-100 inch