M1a. I think they are as near perfect auto rifle that I have ever used. I like the sig 716 as well but for my money M1a is the way to go. I'm not a fan of the AR platform in general though so I am biased. I kicked the M4 to the curb asap. 5.56 vrs 7.62 had a lot to do with that though.
Buy an M1a if ya don't like it someone will buy it off ya. If no one else will let me know and Ill buy it off ya.