For the most part, CA internals will be much better. You start with a reinforced mechbox and gears. The "problematic" parts in CA guns (when they are problematic) are the piston, piston head, tappet plate and spring guide - all cheap and easy to replace. And no China clone will surpass the quality of CA externals. From what I've seen to date, CA have some of the best, most durable metal bodies on the market, and their fiber-reinforced nylon furniture is better than most other stock guns on the market costing even more.
Personally, I put over 20 000 rounds through my CA M15A4 rifle without a hiccup. When I opened it, the stock parts showed no wear. I replaced the "problematic" parts with Systema. The Systema piston lasted all of about 250 rounds, and I had to replace it with the stock piston. The Systema tappet plate lasted a total of about 500 rounds before I replaced it with the stock CA I had removed. The gun has seen another 2500+ rounds since then without a problem.
So yes, CA are MUCH better than anything that comes out of China without exeption. And remember, you CAN get good guns from companies like JG or Echo 1, but there are a lot more lemons in those brands than with CA. You're taking a much bigger chance of a lemon with AGM than with CA. And even if the AGM is a "good one", the internals and mechbox shell won't last as long as CA.
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