User blog comment:Juracuille/Who're the strongest? Whitebeard Pirates or Blackbeard Pirates/@comment-1636-20100626221355

Before Whitebeard's death: Whitebeard Pirates at ease - that's the reason why Blackbeard hid among them.

After Whitebeard and Ace's deaths: Hard to say, but probably there's a slight advance for Blackbeard Pirates, since I guess Blackbeard could take on most of the 14 remaining commanders at once. Additionally, BB has the advantage of appeal his former mates of betraying them and killing their pops - to lure them into a blind attack on his crew which means certain death.