Okay, so its been said by various people time and time again that overtly huge fantasy melee weapons are not practical in any way whatsoever. They are too large and cumbersome, and in a fair fight against anyone else wielding a more sanely-sized weapon, the guy with the overtly large weapon would lose.
However, what if it wasn't meant to fight other humans?
Is it a reasonable assumption that larger, heftier weapons would fare better than smaller ones against larger creatures who may simply shrug off lesser attacks? Assuming that most people who even thought of fighting such creatures were of heroic stature and could actually wield such weapons.
- For my setting, a lot of people travel alone or in pairs. So they won't have access to organized formations or power in numbers.
- These people are actually the giants from my previous question. Its just that they tend to end up fighting even larger beasts. Hence my statement about heroic stature. Edit: Small misunderstanding, my fault for poor choice of words: The giants are the 'people' who are fighting even bigger things. I'm not talking about people fighting giants. That's a whole 'nother story.
TLDR: Would you carry a bigger axe/sword for hunting a dragon who would otherwise be immune to a regular-sized axe/sword?
Quick Edit: I forgot to mention: Medieval tech, so no guns. Also, just focus on the melee aspect, because bows and other assorted ranged weapons have been covered in another question.