Here’s a head scratcher for ya.....
Generally speaking the GI fibreglass stocks are a little looser (wiggly?, flexy?) than the chi-com stocks. But the chi-com stocks jam the stock ferrule HARD into the barrel band, the GI stocks don’t.... which is better/worse for accuracy? Personally I like the GI fibreglass, I can live with a slightly looser fore end for the ergonomics and “feel”.... but the Chinese stock can be trimmed to clearance the ferrule and the front band. Alternatively the GI stocks can be stiffened.
Another really nice, solid option (for a plastic stock) is the Delta M14 Chassis. It’s very close to a black feather but plastic. Wolverine supplies was selling them, back in the fall of 2017, not sure if they still have them. Like all other US made stocks, they fit M1A rifles like a glove, but need some fitting for Chinese actions.
The Archangel is also another stock worth looking at. Very similar in ergonomics to a JAE chassis, but plastic and much less expensive. Again, fitting is required.
Pretty much the only non-Chinese stocks that will require no fitting (for the action to fit) are USGI, but the selector hole is quite large, and most people prefer the hole to be filled.
John