Little Gransden has movement restrictions
AFAIK, and depending how close you are to Panshanger, Bourne, Top Farm are a bit of a drive. Fowlmere is a great airfield, but if like me you just want a short drive to the airfield, its not so appealing. Arguably, Panshanger had a bigger club / social atmosphere than some of these airfield, but thats subjective I suppose.