Well, I guess I'll add my 2 cents worth...
If you were limited to one, I'd go with .308. Like the rest of those who have posted on this thread have said, the .308 will do the job of the .223, but with more umph...I'm currently waiting on my next .308 as I've grown tired of having only the .223 in the locker.
When you compare both, I think the jury will tip towards the .308. As for those who keep talking about "urban combat" and what not, I'd only add a couple of thoughts, I remember when hurricane Andrew came blowing through Florida...I also remember watching the LA riots on TV...Suddenly, the "urban combat" idea doesn't sound so Walter Mitty...As they say, when 911 doesn't work, it's mighty comforting to have the ole .308 by your side. traintrackker