Not even close to the best. Iverson is better by far. Wade is as well, but he is a 2, not a 1. Then again, why distinguish between the two positions, since both guards share the duties of a point in most situations.
This isn't to say that Tony isn't good at getting through defenses, because he is. Being on the Spurs helps, as the others are at the very least good distractions.
If Tony had to carry the Spurs by himself, he couldn't do it.