I agree, the AR is generally the more accurate rifle, especially if your a target shooter. I do have a Bushmaster Dissapator that shoots on par accuracy wise with some of my AK's though. I think the biggest problem for the AK's in this respect are the sights, and this is why the Aimpoint type sights bring the AK's into the AR's world and make the issue sights a pretty much moot point. The dot works the same on the AK as it does on the AR, put the dot on what you want to shoot, and shoot it, what could be easier?
One thing about the issue AK sights. I actually find them easier to shoot quickly with at closer ranges, 100M or less. Peeps are great, and I do like them for target or more precision shooting, but they can be a bear in some circumstances. Lighting being the biggest problem. Ever had the sun over your back and try and see the front sight on something just slightly dark through the now highlighted rear sight? What your accustomed to looking through is what your eye is now looking at instead. The AK's sights, as primitive as they are supposed to be, work well as a quick combat sight in low light, or regular light for that matter, by just putting the "globe" around the post on top of the "bar" of the rear sight and then put the globe on what you want to shoot. If you shoulder the rifle and do this quickly, then once on target, slowly roll your cheek down, you will see your front post and rear notch are lined up and on target, or very close to it. Works just like the HK's big notch on their 91's/G3's. We as Americans have been conditioned to believe that the M1, M14, M16, type peeps are the best type sight in the world, and for target shooting with iron sights on a military type rifle, it would be right, but for a best all around combat type sight, especially a close range, fast shooting sight, I'll disagree.
There's no doubt the biggest problem for the AK's is the US made and installed trigger groups. I believe you'll find most of the (US)AK related failures occur do to them.
I own a number of both AR's and AK's, so I'm not really biased against one or the other. Both have good points and some not so good. If you treat your tools properly, they will take care of you for a very long time and most likely your kids and their kids. If you dont, you get what you deserve, simple as that. I've never had any problems with my AR's either. They have always worked, even when shot a lot and shot dirty. I have a Colt SP1 that I bought new in 74' that has tens of thousands of rounds through it at this point, and I can ever remember it having a stoppage.(I'm sure it did at some point, they ALL do, but I'm getting CRS, so I dont right now remember a specific one.
) It has shot more than a thousand rounds at a session too,(multiple times) between multiple shooters, and fired fast enough that you would literally burn the skin off your hand if you touched it, allowed to cool and done again. To this day, its still a good shooter and is still accurate. I think most of this crap about A being better than B is just more internet BS being repeated over and over, by people who, dislike one or the other, have never owned or shot one, or if they did, it was a mag or two off a bench, or worse yet, bumped off the hip, and they never took the time to learn the gun.