After having turned around the whole europe and eaten the best everywhere, here's my conclusions:

The best sausages of the world are made by the best butchers, these are now all around the world, being able to make the best of something is not a genetic thing but a matter of knowing how to do things properly. As far as what I've ate, best sausages are based on french and italian recipes. Even in Germany where they make astonishing sausages (and some greasy and lousiest ones) they can't match the French and Italian wursts.

French and Italian by a good distance for me even though I am sure that some English, Canadian or whatever butchers make some kick ass too.