Talk:Type 94 Anti-Aircraft Fire Director/@comment-61.120.187.198-20150313151534/@comment-203.173.92.26-20150324071825

It all depend on who you want to equip it on. 10cm HA AAFD is a light main gun, while the 12.7 HA AAFD is a secondary gun.

10cm HA AAFD can only be equipped on DD, CL, and utility ships while the 12.7cm HA AAFD can be equipped on everything except DD and SS. The 10cm is better statwise, and it can be used for artillery spotting by CLs. The 12.7cm is more versatile.

So, if you wish to equip it for you DD, CL, or utility ships, the 10cm is better. Go 12.7cm if you want it for anything else.