The first longarm I owned was a Plainfield M1 carbine. It shot beautifully. Accurate, and reliable. However I succumbed to the desire for a Mini 14, and traded my carbine for a stainless Mini.
I regretted it as soon as I shot it. It was less accurate at 50yds than the carbine was at 100. It also felt like brick by comparison.
For a few years, I got on a 9mm carbine kick. I owned several...Marlin, hipoint, and an Uzi.
The hipoint 9mm carbine was fantastic. I put a few thousand round through it of every variety...white box, +P, +P+...it all fed, functioned, some were very accurate. With one particular +P+ Federal load, I was getting one hole two inch groups at 50yds, and with any load, it would keep all rounds on a paper plate at 100yds shooting rapidly offhand.
The only drawback was the limited capacity. If the hipoint were redesigned to use Glock 17 mags, it would be a world beater.
The Uzi was the best of the bunch.
However, when CMP announced a large sale of carbines a few years ago, I immediately got my cmp qualifications straight, sold my Uzi, and drove to North store to pick mine out.
I ended up with a 6-digit Inland in a Rockola I-cut stock with a new looking Underwood barrel.
Now, I don't dislike the AR. I've owned several over the years, and currently own an AR carbine I put together myself. I enjoy shooting it, and would have no issue using it for HD. I think every honest American should own one and be proficient in its use.
I just prefer the carbine for HD use.
For me, the carbine just fits me great. It points like finger for me, like a fine sporting rifle. I've experienced this with a few rifles, the closest being a Winchester 30-30 94.
I load it with Critical Defense FTX JHP, which I've shot out to 100yds and found to be accurate. I wouldn't have a problem using PPU soft points though...they shoot well, and are cheaper.
The 5.56 is a great round, and the AR is a proven weapon, easily affordable these days, and easy to build and work on.
But the carbine speaks to me. I knew a Cleveland cop who used one in Korea at the frozen Chosin as a navy corpsman with the Marines, and later used one as a cop responding to the race riots of the 1960's (which he described as "total war"). He had his choice of the Winchester 94, shotgun, Remington semiauto 308, or the carbine.
He kept one in his house the rest of his life.
The 30carbine round fits into a nice envelope of power. Better than a handgun, not quite a rifle, and performs very well in that range.
If the stars hadn't aligned just right when I got my GI carbine, I wouldn't own one now...and I have no interest in any non-GI carbine. But I do, and I'm glad I do.
Otherwise, I'd be perfectly happy with an AR.