I have a P365 standard size. I have smallish hands so the 10 round magazines aren't too short for me. I just got two 12 round magazines and they come with the grip extensions for the standard size 365s. I found my pistol points better with the longer grip of the 12 rounders. It all depends on how you plan to carry your pistol. Using the 12 rounds mags pocket carry won't work well for me. I plan to get a paddle holster for my 365. My primary carry pistol is a S&W EZ 9 and I carry it in an OWB holster. The EZ 9 is the same length and over all height as a Glock 19 but has a thinner grip (8 rounds) and the mags are easy to load without a magazine loader and the slide is far easier to pull back than may other pistols. The Glocks with staggered column mags are to fat for my hands. Since it's your first pistol I suggest one with a manual safety.
