Dwight is more efficient, by far, and he is also a proven dominant post player by leading his team to the NBA Finals, using an offense that featured him in post position (4-out, 1-in). Gasol has never led a team out of the first round as the primary option.
Dwight is not the best post player, Pau is.
Gasol also doesn't draw the defensive attention Howard does down low...not even remotely close. There is a reason for that.
Gasol has more post moves...and that's it. Give me a dunk over ANY move.
It's ridiculous to even entertain the idea that Pau is better in the post. If it's because of his post moves, then he must be a better post player than Shaq.