I won't come if it's in Amsterdam again, partly because I can't pretend to my mum that it's a completely different meeting and a new experience for me and she can't reply "Oh, but you went last year!" and also because of what everyone else has said about going to the same place again.
The UK has a big freestyle scene, although I can't compare it to any others, there's the park where the London meets happen which we could use and if that's not quite big enough there'll be loads of other places. To be fair, there weather is really inconsistent in the UK but there'll be indoor venues around I imagine.
Spain, as Max said, has no freestyle scene and I think the climate, especially in the Summer, will be too hot for freestyle.
I'm for London.