Tessarael
Adventurer
Yes, it will differ by campaign. However, having a basic idea of what damage types are most common is helpful. it is not metagaming to realize that fire and poison are relatively common, hence resistance to those would be more beneficial than say resistance to acid or lightning. Now if the campaign setting is somewhere cold, then it may well make sense to have resistance to cold. Again, this should be common knowledge in the campaign setting.That information will differ per campaign. Also, IMO it is metagaming to use the MM to optimize your character.

