I've camped on Karting about 5 times up until 3 years ago when it was taken over by Danish mushroom tents. There are some nicer parts of Karting but watch out for the trees in lightning - one exploded during the 24 a few years back and I think there were some minor casualties..... either that or I was abusing my liver and have imagined the whole thing!
Karting does have a slight advantage over MB in that you can get tent pegs in the ground! Also I'm sure the classic won't be over-run with Danes so getting to the lav shouldn't be so bad!!
The classic two years ago was fantastic and pratically empty. I'm hoping that the camp sites aren't too oversubscribed as they were at the 24.