I'd say the best use of Allen Iverson, particularly in his prime, revolved around his dynamic scoring ability, agility, and leadership as a combo guard.
He was best utilized as the focal point of the offense. His quickness, ability to create his own shot, and relentless drives to the basket made him incredibly difficult to guard. During his MVP season (2000-2001), the Philadelphia 76ers built their offense around Iverson, allowing him to dominate the ball, which suited his isolation style and scoring prowess. His best years saw him leading the league in scoring, averaging 30+ points per game on several occasions.
He also thrived in isolation plays, particularly at the top of the key, where he could use his elite handles and speed to break down defenders. His low center of gravity and quick first step made him nearly unstoppable in one-on-one situations. By creating offensive sets that gave him space to operate, coaches like Larry Brown maximized Iverson's talents, particularly against larger or slower defenders.
Just my opinion, though...