Steve, I know your right, but I can't help myself!
I think it comes down to personal preference. Find what suits you better and practice with your gun until it becomes an extension of your body.
I'm addicted to a sport absolutely dominated by AR type rifles, but I shoot a Vepr or a FAL. Why? Because of what suits me personally.
And if you are totally familiar and in harmony with your weapon, you will hold your own no matter what. All of the ergonomic arguments go right out the window if you personally are 100% comfortable and familiar with your personal weapon. I can do an AK mag change faster than 98% of the shooting public can do an AR mag change, even though it is supposed to be much more difficult. (that last 2% whoops me good though.
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Now most ARs are more accurate than most AKs. And in sports that accuracy is the single most important thing (like High Power) then you should go with the accurate rifle. But everybody is different, and accuracy isn't everything in every sport/use.
And many of the criticisms of the AK go right out the window when you look at some of the high quality AKs out there vs. some of the cobbled together weapons most of us are familiar with us. I have an AK with high quality rear mounted peep sights, a safety I can operate with out taking my hand off the grip, and I have shot some pretty dang good groups with it, about as good as I could shoot with any iron sighted rifle in fact. Plus it has a longer stock that fits me, a burly 6'5" guy really well.
7.62x39 has a lousy trajectory. That is a fact. Can't be helped really. But I use it as my 3 gun rifle because I can get 7.62x39 for $75 a case, and I hardly ever need to engage anything past 200 yards. (I really like .308, but ammo costs twice as much, so I get less trigger time).
Also there are quality AKs available in .223 and 5.45. Also the cheapest steel cased practice .223 will work through an AK just fine, but may or may not work through your AR.
I think both are good guns, for me PERSONALLY I get more use out of my AKs that I ever have with my ARs. I have sold every AR I have ever owned. (I buy one every couple of years, shoot it for awhile, don't fall in love with it, and sell it).