A good trait of piercing weapons are that a lot of the weapons are spears, which allow reach attacks (press F to attack a enemy 2 or 3 tiles away). Depending on the length of the weapon of course. Fencing and a good sword with high skill allows you to stop-thrust and kill pretty much anything. However that’s pretty much a given with any martial art once you hit around 4-6 in the skill you pretty much become unstoppable.
Cutting weapons also have reach weapons, halberds, glaives, and to a lesser extent, whips. These are also decent weapons if you have a high skill in cutting and don’t want to train piercing for spears.
Looking at this you might ask “Well, if cutting has weapons that can do reach attacks too, what’s the point of piercing weapons?” Well, spears are much easier to obtain. A knife spear can be made really early in your game (Literally in about 5 minutes irl time) and can seriously boost your chances of survival early game.
Example: I was playing the hosiptal abandoned challenge. Permanent frail trait, about 50-75% less health. With spears and careful kiting, I was able to survive and pass well into late game where despite my health being extremely low, I was unkillable. Frequently went into melee range too.
Late game you can make a steel spear which is much easier to make and uses less resources and tools than forging a halberd. Awl pike is end-game stuff, really good weapon.
I think piercing weapons can potentially hit enemies behind the one your aiming at. So say you attack one enemy infront of you and it damages the one behind it, over penetration and such.
Don’t quote me on it though, it’s been a while since I played around with piercing weapons.
Bashing weapons are something I haven’t really played with. Though I do remember using a mace against a power armor zombie when bullets and swords didn’t cut it. It worked really well, so there’s that. Strong characters definitely have an advantage with it too.
All in all it comes down to preference. You may be kitted out with a knife spear but just happen to find a zweihander or katana or mace and you just prefer using a certain weapon and switching, roleplay purposes or otherwise.