Tom - I wouldn't definitively say that I liked Ganton more than any of the heathland gems in Surrey (such as Walton Heath), but I played it the day after I played Woodhall Spa and Ganton seemed clearly superior to me of the two. It's been a few years, but if memory serves I rather liked the routing at Ganton, really thought the terrain was varied and interesting - much more made for golf than the flatness of WS - and generally had the collection of more interesting holes, particularly a much stronger finish. I'm not a particular lover of great bunker design relative to others, I guess, and WS seems to be almost all about the bunkers, so I'm sure that's part of it as well. WS may perhaps be the slightly prettier course (although I liked the open, hilly panoramas at Ganton as well), but that didn't weigh heavily with me either.
Hope that answers the question!
Cheers,
Darren