"16.25in" barrel so it's not a SBR (Short Barreled Rifle, register with the BATFE and pay $200 etc.), so you'll get more energy out of the rounds, and presumably better hollow point performance, but I wouldn't be confident about that without testing with calibrated gelatin.
Me, 1911 for retention, and maybe a long gun if I'm bunkering waiting for the police to arrive (slow to access in the main gun safe).
I'll take "What is a carbine chambered in a pistol round for $200, Alex."
The SUB-2000 uses the 9x19 round, so it's basically a pistol with better ergonomics.
Defending a home with a full rifle round in close quarters, say a .30-06 or 8mm Mauser, would be kinda silly--but that carbine is fine.