I know there is a thread on here already about the 'bad guy's mindset' that applies to home defense but I don't remember who posted it...
Anyway, since someone is willing to illegally enter your domain it is reasonable to assume they are mentally prepared for confrontation. In which case, you want to be ready with something you are comfortable and quick with handling. If this 1911 carbine is something that's comfortable and instinctive to use then use it for HD.
One thing to think about though is the gun you shoot the invader with could be locked up in an evidence locker for almost ever.
Anyway, since someone is willing to illegally enter your domain it is reasonable to assume they are mentally prepared for confrontation. In which case, you want to be ready with something you are comfortable and quick with handling. If this 1911 carbine is something that's comfortable and instinctive to use then use it for HD.
One thing to think about though is the gun you shoot the invader with could be locked up in an evidence locker for almost ever.