You've got my two favorites there for sure, Scarpia. Arrau's set was my first and I love the way every phrase, every note, is handled with exquisite care. Tipo's set is great too. I can't say anything specific, as I don't know it as well as the Arrau, but I certainly plan to hear it more. In fact, I think that many pianists play these works well, I wonder if it's because they are beloved by pianists? Pires has a very nice, if somewhat "big" way with them, perhaps great Nocturnes to enjoy at dusk. Moravec's classic set features his gorgeous tone and his deep sensitivity. Rubinstein's two mono sets are wonderful, with the earliest one being my preferred of the two. Wasowski is not as good here as he is with the Mazurkas, but he's still among the better ones that I have heard. Like you, I enjoy Ashkenazy's, but find that others bring more to these works.