ive got a new agent in 45acp. i really like the lack of traditional sights. in a true self defense situation sights just serve to get snagged on stuff. if you got time to aim, the trench sight of the new agent serves very very well.
the 45acp is very controllable and very fast on follow up shots. i would imagine the 9mm version would be even more so.
the only negative i an think of going 9mm over 45acp is spare mags for 9mm chambering arent easy to find nor terribly cheap without a lot of options. i know my 45 version uses regular full size mags just fine. this means you can use the small one it comes with then full size mags for reloads.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...