It makes sense comparing Optoma GT5600 vs Optoma UHL55 because they both are able to give some premium features. Based on our rating, GT5600 has a total rating of 8 out of 10 versus 9 for UHL55.
Advantages Optoma GT5600 over Optoma UHL55
Better brightness: 3600 vs 1500 lumens
Lower noise level, 25 dB vs 28 dB
Advantages Optoma UHL55 over Optoma GT5600
Bring the cinematic 4K UHD experience home with the UHL55
Bigger projection screen size: 30-200 inch vs 80-100 inch
Lower power consumption, 170 W vs 285 W
UHL55 is HDR-compatible
Longer lamp life (normal mode): 20000 vs 4000 hours