Sarcasticgamer.com compares and contrasts Halo 3 and Halo Reach and decidedly proclaims that Halo Reach will not sell more than Halo 3.
From the article: "Halo Reach couldn’t have picked a better time to come out. After the Summer doldrums, where the only big games included StarCraft 2, Mafia II, and maybe even NHL 2k11, Halo Reach hits at the peak of summer/fall boredom just before the Christmas season storm.
But will it sell more than Halo 3? I initially said no… Am I wrong? Read on."