Pasta dishes are very local to each region in Italy. In Rome, where I live, the favorites are:
Move to Sicily and favorites become
Then you have Strascicate alle cime di rapa in Puglia, Troffie fagiolini patate e pesto in Ligury, Tagliatelle al ragù in Emilia and so on.
Being the favorites in one region doesn't mean you cannot find them anywhere else, however they are often done in a more or less slightly different way as you move away from their region.