As in, which of these cultures remained closest to "Roman" culture? I'm wondering as my German teacher has told me that the Spanish were some of the last hold outs for Roman culture, but then that gets me thinking about the French and Italian cultures seeing as how they had taken over previously Roman provinces.
I'm going to speak about France. So there is something called Gallo-Roman culture, it is a "mix" between the Roman culture and the culture from Gaule. But let's make something clear: the concept of France didn't exist at the time and Rome had influenced what is called today France differently in different regions. The south east of France (especially Provence, the language Provençal is close to Latin) was extremely romanized you can even today see theater there. Overall the roads that they had created and the cities had influenced the regions. But through the centuries the influence has decreased, however some French "historians" nowadays think that there is still a legacy when it comes to politics.
Overall Spanish and Italian cultures are more Romanized than the French one (exept for the south of France). I think Italian culture has the most legacy from the Roman empire but that's only my opinion.