I like my 1911's and M1, but in terms of practicality and ease, I take my AR. it's been continually improved and refined over the last 50 years..... AK's have just been accessorized. We are talking about post WW2 technology here. Come on man!
If something goes wrong with the AR, being the most popular rifle in the US, you could easily cannibalize parts from other rifles to get your's back in action. No special tools. You can use a nail and a hammer, in a pinch. Probably make your Gucci race AR look like crap, but you could do it. AK breaks, bends, or burst, you SOL....
JMHO, Whatever works for you and you trust.