Okay, actually we can compare the AK-47 with the best varients of the AR's because the AK has pretty much not changed since '47, but the latest and greatest AR's are still AR's, they have just evolved from its more primitive state. But you cant compare the AK-74 with the AR in this debate because the AK-74 is a completely different rifle than the AK-47, the AK-74 shoots a round thats even smaller than the 5.56, it shoots a 5.45. Sure the AK-74 vs. the AR would be a better debate than the AK-47 vs AR "because of accuracy and round similarities of the AK-74 and AR", but this gun is still not the AK-47 even though its similar to it. That would be like me bringing up a HK-416 vs the AK, sure the 416 is similar to the AR, but it's also completely different. Heres a vid of it.
http://www.youtube.com/watch?v=gZpZryZEiY4