Both are LCD screens. What's changing is the source of illumination for the LCD panel.
Old = CCFL.
New = LED.
You can google CCFL since I will not write what that is. But the LED in most cases will give you more battery time and will out last the CCFL which does dim and shift color over time.
As the LCD didn't change and only the lighting, there is no difference in lag, glare, and angle.
LCDs did not have a burn in issue. However there are some that will propagate myths and you must slap them silly over this quickly while you can.
So I'm buying a new laptop workstation, Dell Precision M6400, and the Dell website gives you the option to upgrade to a RGB LED screen instead of a LCD screen.
I've never used an LED screen. Does anyone know what the pros and cons of LED vs LCD screen are, as far as screen lag, burn-in, viewing angle, glare, etc.?