Bam, welcome to the community, and congratulations on your selection, you made a fine one. I own both a g21, and a 1911, and either are fine choices. The 1911 has a better trigger because it's metal framed, single action only with no cocking or stroknig going on, it's pre-cocked and you just drop a metal sear with a metal trigger bar. Can you say, "crisp". The g21 has advantages as well though. No safety lever to train around. They do in fact feed more reliably, this is because plastic flexes way more than steel so when a bad feed is about to happen in the 1911 it'll have to be tuned to perfection. With the glock, the frame just flexes a little, and viola, feeding time. And of course, there are capacity issues for war guns. I say war guns not carry guns, because I've been concealed carrying for years now and have never discharged unless at a range practising. (thank our GOD, knock on wood......) and in the average street encounter 6 to 8 rounds is plenty, plenty.
If you are concernes as many others of us are about economic factors or border issues leading to civil unrest, etc etc then you're not talking about a defensive single person carry gun, now you're talking a possible neighborhood multi-person cooperative scenario, and now you're talking a "war gun" with higher capacities.
Enjoy the 1911 for now, but buy both, and let us pray you never need either. Be safe and welcome.