Whilst I love flying in Germany my vote goes to France
Most of my long touring has been round France
Superb Atc.
Landing at large airfields in class D never an issue
Complex looking airspace melts away with Atc help
Long flights possible Vfr as weather more predictable
Even my favourite local bimble is le touquet
My best and most ensuring flying memories of long flights are all in France.
I cant recommend it enough.
Though the fly in to tempelhof Berlin just before it closed
was fantastic for ease and for those with low hours France can't be beaten