[DRG]

How the AI picks things can be convoluted and depends on if they are rare ( radio code ending in 1 ) or common ( radio code ending in 2 ) or radio code ending in zero which is more or less " average

BUT

The AI tends to pick from the bottom of the list up and there are randoms built into everything in the game to stop it from being predictable but does seem if the AI finds too many rare units in a row it can sometimes just decide to pick one anyway and in the Ukraine OOB for example, the "western" armour is generally near the end of the list and the Russian origin units are more near the front

BUT

The picker may go all the way up one time then work it's way down or it may pick from the bottom of the list. We sometimes have had to make things rare near the end of the list just to keep the AI from buying it too often