These are beautiful places, you can´t go wrong !! Good choice.
I have been to Corsica several times, it´s the French best kept secret in terms of travel destinations
(they happily leave the mediterranean coast to foreigners while they secretly embark for Corsica!!).
We call it "the island of beauty", because the landscapes, especially on the west coast, are breathtaking.....pine trees, pink rock mountains, transparent blue water, then white cliffs (chalk) in the south.
The architecture is very varied, because of the historical past. Corsica used to be italian before becoming French. The inhabitants still use their dialect, with french. They have a strong sense of identity and belonging to the Island, are a bit cold to tourists (the invaders).