I just went to PetSmart and Petco last night. My PetSmart didn't have the tanks on sale yet (didn't look at their ads and not signed up for newsletter). Petco did have the sale, I saw Tetra and Aqueon brands there.
I compared two different (4 total) Tetra and Aqueon 10 gallon tanks and the glass thickness was the same, Tetra looked tempered (darker green tint to glass), Aqueon had better and thicker plastic framing, silicone job on both brands were a bit on the sloppy side. I would pick Aqueon between the two. I only compared the 10 gallons (looking to start another shrimp tank), so I can't say if the larger tanks are of better/worse quality.
Remember they are "open top tanks", meaning no lids. Can anyone recommend good, cheap lids?