Crystal Clear

Had to stop and take a picture, the sky is crystal clear tonight. Here are comparison shots between Tamron SP 150-600mm F/5-6.3 Di VC USD at 600mm and 1200mm (600 + 2x Pro Teleconverter.) Share your thoughts - which image do you like better?

First Quarter 15 March 2016 Nikon D750 ISO 200 600mm f/13 1/250 sec. 

First Quarter 15 March 2016 Nikon D750 ISO 200 1200mm f/11 1/80 sec.