biggie never wrote anything down. All of his songs were freestyles. He also hooked up with DJ Premier for alot of the beats. In one studio session biggie got blunted and made good music.
tupac thought about his shit and wrote it down for a long time. Good beats also came once in a while because of lazy west coast producers who never finished beats. Also pac is a paranoid bitch who turned against everyone while being locked up
pac being so much better of a story teller is a common fallacy.
listen to I Got a Story to Tell by biggie or Gimme The Loot (two completely different flows and they were freestyled)
biggie = amazing
pac = would be washed up or in a half-way house by now