Special Ability For DL/DC

[Tactician]

For those who added a special ability on their DL/DC, which one gave better results, aerial defender or defensive wall?
A user has recommended choosing between the two special ability according to the height of the player, but a tall player has an advantage in both of them.

Take into consideration that I have not asked which is best to have between the two. What I have asked is which has worked best for a player having position DL/DC (initially intended to use as DL, but this may change).