[Mobhack]

The list of things you posted into an irrelevant thread in another forum should have given you a clue.

One of the most important characteristics of a unit is the Unit Class. It is the first thing one should look at, if comparing items.

One of that list was a particular unit class, the rest are not. Both were of the fortress types (there are 2 in WW2, one in MBT). But - different unit classes may do things differently. Like preferring to hold AAA fire till closer.

Fortification <> Bunker.

And, as pointed out previously - neither of the 2 fortification unit classes is a primary AAA unit, so they will only fire in self defence generally. AAA units will generally try to fire at the first opportunity. If your scenario is an assault/defend pair then any defending flak get dug in in an emplacement for "free".