Umbrella and Firework are both on the same level of success . All the people claiming GGB is bigger because of Umbrella need to realize Firework was just as huge of a hit.
Stripped is bigger than baby one more time and i'll explain why. Baby One More time had hughe sales and cute smiles from Britney but she had a peer Christina Aguilera. Stripped was Christina's coming of age album that made an actual impact in music and she was the absolute HBIC at that time. It was a personal album, one thing britney had never had until the recent release of Britney Jean 10 years after Stripped.
