Whether LG is better on spec or not, from the 3 LG screens and 1 Samsung screen I received on 9300, I chose to keep the Samsung one as it seemed to be the best for me. Well, this could be luck too (that I got 3 bad LG screens and 1 really good Samsung screen).. I could spot the sparkles easily (they actually bug me) on the LG screens and yet the sparkles aren't noticeable at all (perhaps they would if I used a magnifier) on the Samsung screen.
BTW, I'm referring to WXGA+ screens, which is what OP has. It might be totally different for WUXGA screens.