Hello,
cachalote ...
My advice would be to wait. I can't think of a single recent set (maybe some else can) that wasn't, sooner or later, released in both the US and Europe.
In the past, there were a few variants in the US, the UK, Spain, Greece and South America. However, that all seems to be history, as sets released in a local market seem to eventually find their way to the general market. Some of the exceptions might be those that are made exclusively for specific stores or organizations.
Well, that's my two cents worth of advice ...
All the best,
Richard