If I had to pick one, I would say I don't have a favorite, but I loved Rewrite, Tsukihime, Planetarium, fate/stay night, and maybe others x)

I had fun with Long Live the Queen, though it is a bit more choose your own adventury than visual novelly. Unfortunately many of the visual novels I have played beyond that had Japanese names and had been suggested to me by a friend, I could not pronounce the names much less remember them.

My favorite is definitely Song of Saya, because I really like dark and grotesque stories (even though the ending in this one was more beautiful than dark).

Thanks !

Clannad or Doki Doki Literature Club (which is Free, check It out)