Whitby caters for children - clog dance and music sessions + the beach. Things happen all over the town so be prepared to travel to things from the camp site. Great fish and chips. The headliners tend to be fewer in number.
Cambridge is more like a pop festival - stand to watch the performers - not so good with little ones. You have to que to sing or to play at the club tent. However, you can camp on site. Plenty of ethnic food + everything happens on site.
FloraG.