locarno24 said:
The best answer is "probably Merc 2nd Edition" - there was an extended chew-through of the weapons and armour piercing rules here on the forums, so those are the newer rules published recently as an update, and have had more public debate on them.
That said, your game, your rules.
I realize that people didn't like the armor piercing rules, and I don't quite remember why, but I like to have variation and options. Also, I mean, it just makes sense for things like gauss to be effective against armor. Is it balanced? Not really at all, but that can be solved by realistically restricting things, also by applying the march of technology. Lower tech level AP bullets will have a harder time piercing higher tech level armor.
I guess I kinda figured out my own question, but I guess I asked more to hear arguments for using both sides to develop my own opinion.