User blog comment:SlyCooperFan1/Ace Combat Infinity Update 11/@comment-75.95.173.188-20150918224629/@comment-26882946-20150919040236

20mm seems to have more damage output compared to 12/13mm.

12/13mm seems to have more rate of fire compared to 20mm

20 has less ammunition compared to 12/13mm (except for the German plane)

cmiiw.