Unfortunately, I have been trying to find a damier azur 30inch speedy made in France for the past year with no luck. It appears that when I bag is first released the early shipments are from france after that all we get are made in the USA
There's no difference in quality but some people prefer to buy the European-made bags becuase they're more in line with LV's French heritage. The USA bags are made in San Dimas, CA and are sold exclusively to the US market, so you'll only see them here.
I myself only buy the European-made items- it's harder but you can generally track one down for pretty much any bag.