Data structures

Is it bad using linked lists where i could possibly use arrays?
Having a dynamic data structure is nice in case i decide i need
to remove / add more elements later, but in this case it's unlikely.

What is "good practice" in this case?

I should probably split up further linked lists into mutable and immutable linked lists:

Mutable:
Appending and splitting is most efficient.

Immutable:
Appending and splitting is "half-bad" AFAIK.