Nemrut Dagi

I am planning to vsit Nemrut Dagi on November 25 and 26 and I want to see the sunset and sunrise up there. I can fly from Istanbul to either Adiyaman or Malatya. Can someone pls give me an advice on which city would make a better base? How much would it cost for a tour from that city? I checked the flight out from either Adiyaman or Malatya to Istanbul is at around 9:30am on November 26. Do you think I will have enough time to catch my flight after seeing the sunrise?

Thank you in advance for your help. Any hotel or tour guide recommendation are highly appreciated.