AS far as I know, the only difference besides the LEDs, is a better heat sink and improved mounting with the 212 LED. I doubt you'd be able to tell the difference, but if you could, the 212 LED would be a tiny improvement. They both have the same number of and size of pipes. Same fan, same radiator...
you can find several reviews online of the 212 LED. Example: http://www.kitguru.net/components/cooling/dominic-moass/cooler-master-hyper-212-led-review/