Agree with FootyFan. Iniesta is by far the most enjoyable individual player for me. He's very similar to Zidane and Kaka in that regard, the way he runs, moves, and maneuvers with the ball reminds me of Zizou. Messi is definitely more effective, no argument there, but Iniesta for me is more enjoyable to watch. The problem is you can't measure aesthetics and "magical" play, you just know it when you see it.
And there's no way to measure this but he is one of the hardest to dispossess. So many times he works his way out of challenges and 2 or 3 players teaming up on him. And yes, so does Messi, but Messi does it with acceleration and quick directional changes. Iniesta does it with minimal space and without dribbling, but with accurate close control and "trickery." How many times he's at the byline and you think there's no way for him to beat the defender except pass back to a midfielder or the LB, and he does that sick Laudrup move, countless times.
There was this instance in the Milan game, I have no idea what minute but will surely be found in a "Iniesta vs Milan" compilation, where I think Messi passed to him near the halfline, and 3 Milan players immediately crowded Iniesta. I was sure they'd dispossess him but he controlled the ball with his left foot, sidestepped and held it with his right, then brought behind his left foot again before being fouled by KPB I think. Can't put it into words really, there's bound to be a clip or a gif anyways.