I've used S&B, Denel, PMP, Magtech, and IMI, with fairly large quantities of each.
They all shoot similarly -- accurate, reliable, etc. -- but Denel seems to be a bit milder than most, and the S&B a bit hotter. S&B is the dirtiest, but it is my ammo of choice for 9mm.
(The .45, in my experience, seems to be a milder shooting .45 acp than some. I like it too.)