VivaBarca
If Carlsberg did forum members
That's because Messi is a lot faster not because he's a better dribbler. What makes Iniesta imo the best dribbler in the world is that he doesn't rely on pace to beat defenders, it's just pure dribbling skills.
As I said, Messi has a lot more pace. Iniesta is somewhat slow, which makes the way he beats defenders even more impressive. He relies solely on dribbling technique.
Messi could still beat the defenders without his pace, although obviously his ability to score wondergoals would be hampered.