best reflector? what brand? 6 or 8 inch flanges?

what reflectors would you guys say are best? I'm thinking about getting hydrofarm daystar A/C or a radiant A/C reflectors (2x 1000w's), is it better to go with the 6 or 8 inch flanges for cooling?

I am very happy with my Daystar 6" AC. The Hydrofarm ExtraSun my bud has works very well too. Its a 6" too.

XXtrasuns are my personal preference. With 2X 1000w You could easily get away with 6" snf s 450 CFM fan. If you went to 8" you would almost be doubling the CFMs through the lights 8" @ 750 cfm............

8" hoods are a few inches taller so if height is an issue, steer clear. I like 8"s because they move a lot of air.