I got the .25 and I load it with Mag-Safes. They're more powerful than any .22 lr, even tho they cost about 100,000 times as much.
Sorry, but the rimfire ignition system is nothing I'm willing to risk my life on. (Now the obvious question becomes . . . "But you're willing to risk your life on a .25?! What are you, nuts?") I've fired a bunch of them - as a sportsman, and tons more on the college rifle and pistol teams - and they're just not reliable enough. The centerfire ignition is markedly better - good enough to depend on.
Now, having said that: I got my Beretta 950 back before there WAS a small .32, and even before Colt brought out the Mustang (let alone the Pocketlite Mustang). I wanted something to back up my .357, something tiny, and the .22/.25 choice was pretty much it. This is not the case today. Sub MOA is right: if you're getting something the size of a Beretta (fine guns, BTW), get it in a better caliber. I don't even USE the 950 anymore - I just don't think I'd want to trust my life to it. Sure it MIGHT do the job. But if there's a reason to carry a gun, there's a reason to carry a gun that WILL do the job. The .32 isn't THAT much more (you're still undergunned, but it's so much better than a .25); I would wholeheartedly recommend you save your money and get one. That's what I would do now.
Just my $.02.
cheers,
erich