Capacity variations are normal, and a slightly higher reported capacity does not mean that the disc is better. Discs having lower capacity may actually result in better recorded quality. Heating effects during a long recording may also degrade quality at high values of ATime. Only 35 MB to 70 MB of capacity will be unused, while quality may be significantly improved. Another capacity risk is the appeal of 80 minute discs.
Limited availability coupled with premium prices create a false impression of superiority.
Avoid such super-high capacity discs having capacities of 77 to 80 minutes. Such discs can be recorded in many drives, but not in all. More important, they will not be readable in all drives.