The Magpul physically feels better in general when compared to the A&K
Performance out of the box, again Magpul performs better.
Now as stated previously. The A&K is about $250 cheaper, and honestly simply putting $150 into the gun will have it perform better than the Magpul model and you can use the extra $100 for mags.
It's honestly the route I'd take if I were interested in the Masada. Even if you don't know about internals, I'd recommend you use the gun for about a month, then take it to a tech and get it upgraded. I say a month so you know how the gun feels, no sense upgrading what you don't like externally.
Skip the formalities, it's Buster. The one, the only Buster
The man makes the gun, the gun doesn't make the man.
STOP SAYING I GOT X AMOUNT OF KILL WITH THIS GUN!
It's a useless phrase. It comes down to skill
Newb = New player who hasn't had a chance to gain correct knowledge
Noob = Old player who's had a chance, but has yet to gain correct knowledge
People tend to base risk analysis more on stories than on data.