[GZG] [SG] GPE Artillery

In Stargrunt, is there any reason to use General Purpose Artillery?

Anti-Personnel warheads do exactly the same against vehicles, and
are better against troops, so if you don't know what you're going to hit,
you're better off using an AP warhead.

Should AP warheads have a lower impact against vehicles, or is there some
other feature that I've missed? GP warheads don't seem to even exist in
Dirtside.

Cheers.