Why is Vendal age helmets more lavishly decorated than helmets from the later Viking age?

by Legionary1248

When ever i see a depiction of a vendal age helmet they always look like this and this but Viking Age helmets look similar to this and this. Why is this?

Edit: Mistake in the title, are* not is.

MithrandirTheIstari

not answering, hopefully it doesn't break the rules - what do you mean by Vendal age? one would assume you mean Vandal, and therefore Great Migration, or do you mean something else?

aFoolishFox

Are the earlier helmets actually used, or are they an ornament?