1. KG
2. TD
3. Everyone else.
If you break down every aspect of individual play...KG beats Duncan in virtually every category.
Duncan has the edge in post moves and blocked shots, but I would contend that if KG were not so versatile and gifted with quickness he would have played defense a ton more inside the paint instead of on the perimeter blitzing wings and point guards.
Duncan is a fantastic passer for a big, KG is better.
Duncan has the 15-20 footer down pat, but KG's is better.
Duncan is not that good at the FT line (suggests Center position not PF), KG is better.
3 point shooting, though not a true staple of the big man, KG is still better.
Lastly, on of the more important aspect of Power Forward position - rebounding.
I know the numbers will show that Duncan averages more rebounds per game than KG for their careers. (11.4 to 10.7)
I know that the numbers will show that Duncan has a higher reb. rate and reb% than KG. (But most of that is due in large part of the oreb%).
Duncan certainly wins there because he plays closer to the paint and in the paint much more often than KG.
But even though KG plays more perimeter on offense his oreb% is no joke.
The key here is the dreb%, KG dominates Duncan here even considering KG's lean early seasons coming straight out of HS. For 4 straight seasons KG led the league in this category. Of those 4 seasons he was near 30% rate for dreb. Duncan hasn't come close to 30% in any season in his career.
Even last year, at KG's advanced age he was near 29% dreb.
That's kinda scary, considering how much hops KG has lost due to age and injury.
This shows that KG's rebounding prowess wasn't just reliant on youth and athleticism.
Both can score and both are highly efficient from the Field.
But in the end, KG's defense and versatility outweighs Duncan's traditionalism.