They seem to me to be the most attractive of the potential sleeping giant EPL teams. In London, so all the resources and attractiveness of the city, but also the only major team in South London, so the challenges of a major proximate rival that Fulham or West Ham or Brentford or QPR have to deal with aren't as relevant.
I might like Brentford's current squad a little more - well, maybe just Toney - but I think Palace has a lot of untapped potential.