I like the 9mm well enough. For carry, you can get them in smaller pistols, and smaller is good for CCW. Ammo is cheap, it's easy to shoot. There's a lot to like.
Having said that, I REALLY like the holes a .45 puts in the target. I just picked up a G36 and am going to transition from the PM9 to the G36 for carry, specifically because those great big holes sure instill confidence, especially when they're going where they're supposed to on the target. But, the 9mm has it's place. Count me in the "I neither love nor hate the 9mm, but it serves a purpose" category.