The VP9 is a great platform. I’ve owned three in different ‘flavors’ (colors) as well as a P30. I find it’s a little large to CC IWB if you run a WML, otherwise if you’re not gonna run a light a locally-made 508 Holster IWB runs great and carries well. For OWB I like a Bravo or Raven Kydex holster.
I run mine completely stock and never had a single malfunction in a couple thousand rounds across the three I’ve had. There are a few Gucci upgrades (trigger, mag well, long slide, comp, etc) if you want to run it as a Tricked-out competition gun, although the amount of after-market trinkets aren’t as plentiful as other platforms. For CC, bone stock is totally fine as they have a decent trigger.
I’d recommend spending the little extra $$ to get the “LE” model with stock night sights and the third magazine. Not only are they better for low-light training, the rear sight profile is better for racking the slide off of your holster or belt for one-handed drills in comparison to the “standard” stock sights. I actually prefer the stock night sights over other aftermarket brands.
if you’re left-handed (like me), the ambi controls excel (in my opinion) over a Glock Gen 5 making it an ideal carry choice.
best of luck and enjoy!