Well, first of all basic Springfields and basic new production Colts are very different guns, with Colt being of higher quality and significantly more expensive, so it's wrong to put them in the same category like Canuck44 did.
What does Springfield GI have that Norinco does not? For one thing, better fit and finish. Look at the two close-up pictures below. The first picture shows Springfield GI and Milspec. Notice the uniformly applied finish, proper machining, lack of tool marks and crisp roll marks. The second picture is a Norinco. Notice the crappy finish, rough/uneven roll mark on the slide, abundance of tool marks, incorrectly machined relief cut and slide serrations that look like they've been made by a drunken baboon.
As you can see, Norinco is a much cruder gun. Obviously, these are two individual samples and there may be variations in quality among both manufacturers. However, every Norinco pistol that I’ve ever seen had rough fit and finish that would be considered unacceptable in a higher-priced firearm.
Also, there's the question of reliability. I have no personal experience with Springfields but from what I hear they have a pretty decent reputation. Norincos, on the other hand, are hit or miss at best and a lot of people seem to have problems with theirs.