Short answer: Springfield Rifles, when compared to Norinco, exhibit a much higher fit and finish and are - generally, smoother and marginally more accurate. Also, while the probability of getting a lemon exists with any manufacturer, I believe that that probability is lower with Springfield than Norinco. It's up to you if these factors are worth the price difference between the two.
Personally, I have a Norinco and an LRB and beyond the fit & finish and the slightly better accuracy (I'm talking marginal points here), the Norinco is, to ME, 95% of the rifle that LRB is while being $2300 cheaper. FWIW, I did have a Springfield NM and sold it for a used LRB as i felt that the fit and finish was a touch better (more precise machining and finishing, consistent gaps, tighter fitment of parts, smoother operation).