Best font ,font size and format for Google Adsense

According to my research,i found ranking for better font size,font and format.

• Select formats in the order,
  320*250
  336*280
  160*600
  120*600
  728*90
  remaining..,
• Fonts:
  Arial
  Verdana
  Times
• Font Size:
  Select Medium size only and leave large or small.
• My choice: I'm using more times like this,
  336*280
  Font: Arial
  Font size:Medium