None of the AK-47's were well finished including the Polytech legend. They all shot ok, and were a little more accurate than most people say.
All of my AR's were Colts and they were all beautifully made, totally reliable and very, very accurate.
As far as I am concerned there is not contest. I would take the AR and run.
Was your Legend milled or stamped?
I thought all Legends were milled receivers.
Anyways.. you got it dead right re the AR15s. They drill tacks. Mine has 1 in 7 inch twist barrel. Does a fine job with 62s.
I have two AK's an Arsenal SAM-7S with a Leupold 1.5-5x20(30mmtube)with illuminated circle dot reticle, the other is a select-fire Valmet M-76F in 5.56. Both are great guns and both are accurate.
I had a friend who was pretty much up on the M14's and before he died he gave me his opinion which I will pass on.
He said the Polytech M14's were ok but the smaller parts were not up to standard. The stocks were also poor. He said their receivers were forged and excellent probably better than the Springfield M1A although the Springfield were better overall.
He said he had heard that Springfield had a spotty reputation with some cracked receivers.