I only have personal experience with the Colt but because of the specs I think you're better off with something with midlength gas. Is there better customer support for any of those brands where you live?
Ok I wouldn't get anything longer than 16" because it's already pretty long for running around, and it's plenty long for 200M. I also recommend midlength gas over carbine. The Colt M4 is probably carbine length gas. The Radian is probably ambidextrous if that matters do you. The DI guns are...
So you can go shorter than 16" but not longer? That's interesting. You'll have a better time with something like 11.5" for running around but I don't know how many are available as a full gun from a manufacturer.
But why would I, as a law-abiding, NRA-donating, citizen need to know anything about CQB, breaching, recce, drones, shooting further than 21' with my J frame while cowering in the corner of my bedroom while dialing the blue heroes?
Nobody's getting that much harassment in the slow lane. Exaggeration/10. These are the same people who claim they see sportbikes riding wheelies at 100mph between cars while traffic is crawling.