I have been to both, but I found the modern Le Mans was a bit too much like a with Brits abroad football match.
However....... the Le Mans classic is fantastic!
24Hrs of GT40s, Mustangs, Listers, Bentleys and everthing in between battling it out. Loads of classics drive over from England and there is plenty of drinking.
I was working on a Sadler and a Lister JAguar and I was pissed for about 36hrs!!!
Wait for the classic in 2010!!!!!