In this particular case - not worth it, but there might be a situation where settling on marble is ok.I don't know, there seems to be no real urgency. Science goes a lot faster than builds early on, and the marble tile makes for a poorer capital in the long run (more worthless ocean tiles).
As for settling on hill, it seems that the capital will never be your best builder in this patch, as it does not get the Railroad +50% bonus to hammers - better make it GPFarm with food from maritime CS.