After shooting literally 1000s of rounds in a 40 and 1000s of rounds in a 9mm, I chose a 9mm. Reasons? Performance...The 9mm in a Winchester +P+ round runs circles around a 40+P...On penetration tests the 9mm far outperforms the 40 in any weight. Would I shoot a 40? If I had to but the 9 is a bit lighter to carry and a stronger load...YMMV
LOL at this guy! Only "stronger load" if you aren't comparing apples to apples. Compare top end loads in both calibers and the .40 will blow it away on all counts. With the same weight bullet, 40 is faster, when using heavier bullets = more energy, yada, yada. I prefer shooting the 9 for lots of reasons, but will opt for the 40 if I am in the woods.
This whole debate is kinda like comparing a 300 WM to a 338 WM. Numbers are bigger obviously, but the percentage difference between the two and between the 40 and 9 are about the same.
