Albeit I don’t carry a 9mm anymore (SIG P220 in 45ACP) I have no problem with a 9mm for self defense. I am down to just one 9mm right now (a Behlert tuned Belgium Browning HP), but my 9mm will feed reliably, exceeds my usually anally retentive standards for accuracy, and I shoot it very well. I have a lot of confidence in that weapon and the 9mm round.
Lot of great 9mm rounds available. Experiment, find what you shoot the best and be confident.