Best is always subjective. If I had to rank the top 3 camera phones as of 11/28/2016 they would be:
1) iPhone 7 Plus
2) Google Pixel or Pixel XL
3) Samsung Galaxy S7/ S7 Edge
Since you want Android, most recent evaluations put the Google Pixel series quality slightly above the Galaxy S7 or S7 Edge. Both the Google phones and Samsung phones use the exact same camera.