Personally, I prefer the M1 Carbine. Shorter,lighter, and designed as a PDW. At ranges under 300 yds(preferably under 200) I feel the 30 Carbine is somewhat superior.
The .223Rem/5.56NATO pretty much depends on velocity to do its work for it. Once you get to the newer heavier bullets(and shorter barrels), the velocity drops enough to really affect the effectiveness. As evidence by complaints about M4 Carbine's effectiveness.
The M1 Carbine has a larger diameter heavier bullet, traveling slower. This makes it somewhat akin to the great 9mm v. 45 acp debate.
Where the 30 Carbine would definately be better would be indoors. Smaller cartridge with less powder would have smaller sound signiture(less noise) and easier on the ears than the larger case, bigger powder capicity of the .223 Rem/5.56mm.
The 30 Carbine is roughly a 357 Magnum class cartridge. A 357 Magnum is about 95% effective 1 shot stops(125 gr JHP bullet). Put a hollow point bullet on the 30 carbine, and you vastly increase its effectiveness. Even upgrading to a simpler Soft Point(JSP) helps.
Biggest problem with the 30 Carbine is the lack of cheap/inexpensive ammo, and most of what is out there is FMJ bullets.
The .223Rem/5.56NATO pretty much depends on velocity to do its work for it. Once you get to the newer heavier bullets(and shorter barrels), the velocity drops enough to really affect the effectiveness. As evidence by complaints about M4 Carbine's effectiveness.
The M1 Carbine has a larger diameter heavier bullet, traveling slower. This makes it somewhat akin to the great 9mm v. 45 acp debate.
Where the 30 Carbine would definately be better would be indoors. Smaller cartridge with less powder would have smaller sound signiture(less noise) and easier on the ears than the larger case, bigger powder capicity of the .223 Rem/5.56mm.
The 30 Carbine is roughly a 357 Magnum class cartridge. A 357 Magnum is about 95% effective 1 shot stops(125 gr JHP bullet). Put a hollow point bullet on the 30 carbine, and you vastly increase its effectiveness. Even upgrading to a simpler Soft Point(JSP) helps.
Biggest problem with the 30 Carbine is the lack of cheap/inexpensive ammo, and most of what is out there is FMJ bullets.

i think you lose this one. but its ok, we all lose a few internet meaningless battles. 
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