[Mijka]

I guess it can boil down to the range of qualities available.

In France croissants are available everywhere but you have a very high range coming from high artisan standards to very low industrial products with very basic places in the middle mostly heating stuff rather than doing the whole process.

In Japan i guess there's less available bakeries specialized in things like croissants and they sell it as a high quality product. There's also highly qualified bakers from France that are working in foreign countries.

Too much possibles biases to really judge.