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I think the first one was of choice, 2nd was with a teammate, and last one was from a wheel of possible choices. The wheel has a selection of famous dunks from the past. Some were in time categories, like the 70's or 80's, while others were like Dr. J, His Airness (MJ), and the Human Highlight Film (Dominique).
So on the first one, you could do whatever you wanted. 2nd was like a teammate has to pass to you (J-Rich had a great one on this, but he missed it). On the third one, you have to emulate whatever you get.
3rd one really screwed everyone cause a guy might not necessarily have the physical ability to do something, like palm a ball. Ex. Steve Francis had to do a Statue of Liberty (thats like a slow 360 from kind of close to the free throw line while having the ball palmed and outstretched the whole time).