If, as has been suggested, the only thing that matters is sheer survivability, then only a complete and utter moron would be adventuring in the first place. Far safer to stay at home I would think than suicidally face an endless array of potentially lethal threats. Whether or not you are carrying a mace or a warhammer is way, way, way beside the point.
One problem I have with assuming that every fighter trained in martial weapons would always be able to distinguish minute differences between every possible weapon type is that assumption is making a TON of unreasonable assumptions about the game world. Namely that figters really are trained to supremacy on every possible weapon in the world and have complete empirical knowledge of the relative worth of each in battle. In any world I've ever run, that's lunacy. In most worlds, fighters would likely be trained in a handful of weapons and have a passing familiarity with some of the more common alternatives.
Beyond that, supposing that every person who might find themselves on an adventure in such a world is indeed a hardened mercenary with an ultra-precise and unfailing knowledge of the relative worths of every weapon is also lunacy.
...and beyond even that, supposing that every not-so-knowledgeable person on an adventure receives the benefit of a fighter type to "helpfully" point out the idiocy and suicidal nature of using a minutely less effective weapon, it is also lunacy to assume that all of those people would be willing to immediately switch weapons, no matter the reasons for their initial choice or the nature of their character.
One problem I have with assuming that every fighter trained in martial weapons would always be able to distinguish minute differences between every possible weapon type is that assumption is making a TON of unreasonable assumptions about the game world. Namely that figters really are trained to supremacy on every possible weapon in the world and have complete empirical knowledge of the relative worth of each in battle. In any world I've ever run, that's lunacy. In most worlds, fighters would likely be trained in a handful of weapons and have a passing familiarity with some of the more common alternatives.
Beyond that, supposing that every person who might find themselves on an adventure in such a world is indeed a hardened mercenary with an ultra-precise and unfailing knowledge of the relative worths of every weapon is also lunacy.
...and beyond even that, supposing that every not-so-knowledgeable person on an adventure receives the benefit of a fighter type to "helpfully" point out the idiocy and suicidal nature of using a minutely less effective weapon, it is also lunacy to assume that all of those people would be willing to immediately switch weapons, no matter the reasons for their initial choice or the nature of their character.