I am a sucker for PCCs, especially ones that use a magazine in common with one (or more) of my pistols. I currently own a 9mm AR (Oly system), a CX4 Storm, 2 Kel-Tec folders (a SUB-9 & a SUB-2000), a Marlin Camp Carbine, and a CM-11 carbine
. Back before the AWB, I also had an UZI carbine and a HK94A3 (shouldn't have parted with either one of those...
). FWIW, I also have .357 & .44 lever-guns I love, but I know this thread is about mag-fed semi-autos.
My favorite of the bunch is the Beretta Storm for a host of reasons, many of which I realize are entirely subjective. No, it's not perfect. Yes, I wish it ran off Glock mags (Glocks are my primary handguns, although I do own a few Beretta 92s & have plenty of mags for that platform) and the day Gaston decides to give us a quality carbine that uses Glock mags I will eschew my wonderful little CX4 for it, I'm sure.
Were I planning to use a PCC for SD/HD (I'm not), I would have to go with the Kel-Tec because (1) my SD/HD hanguns are Glocks and (2) the two Kel-Tecs I own have been great. But just using PCCs for fun (which I do), if I had to pick I would choose the Storm because I simply like it the best. (The 9mm AR is a
close second, and second only because it doesn't share mags with anything else I own.)