I love mine and always thought it's gas system superior to the AR.
But, I've been shooting my AR for about 2 years now and hadn't touched the Daewoo, then I took it out last month and tried it out. For the advantage of keeping the carbon out of the bolt and carrier assembly (using a gas piston) you sacrifice on recoil. The DaeWoo recoil while less than the AK is certainly enough to take you off target for quick follow up shots. And I'm sure on full auto it would be much less accurate than the M16A2.
I am sufficiently confident in my Bushy AK shorty that I think I would now chose it over the Daewoo if SHTF. When engaging multiple targets at 100 yards, there is no beating the AR.
As for compatability, the Daewoo shares with the AR the hammer, trigger, hammer spring, trigger spring, and sear. That's about it.
It's a great novelty, but I don't take it to the range that much as I can't replace anything should it break. As a second rifle, great, if you can only get one, go with the AR.