Arguably approximately same power in the round (at least, the same real world effectiveness).
I'm a fan of the 9mm, but it's not up to .357 standards. Velocity and muzzle energy are only part of the equation. Bullet weight, composition, and shape also make a significant difference.
Then there's the gun itself. The S&W 66 simply has better sights and ergonomics for me than many semiautos.