I lean toward having a carbine in a pistol caliber and the matching caliber pistol. No fumbling around for ammo. On the other hand, I have about 7 different calibers running around the mansion.
Like I didn’t have enough toys I bought an Enfield #4 mk1 last weekend at a gunshow , having a hard time finding 303 ammo for it , only 80 rounds out of three shops I’ve been to and 40 of these I bought at the show.
If price is no object, I would recommend a Kriss. Otherwise, a Hi-Point carbine.
I love my Ruger PC-9 9mm police carbine. Same mags as the Ruger P series pistols and the stock is heavy enough to be a weapon by itself. Too bad they went out of production a few years ago.