Here are some of the cases when you might want to use a linked list over an ArrayList in C#:

• When you need to frequently insert or delete elements from the list.
• When you need to keep the list sorted.
• When you need to traverse the list in both directions.
• When you need to represent a queue or stack data structure.
• When you need to save memory.

Here are some of the cases when you might want to use an ArrayList over a linked list in C#:

• When you need to access elements in the list by their index.
• When you need to iterate over the list in a loop.
• When you need to add or remove elements from the list in a random order.
• When you need to represent a dynamic array data structure.
• When you need to perform efficient random access operations on the list.

Ultimately, the best choice for a particular application depends on the specific needs of the application.

Here are some additional things to consider when choosing between a linked list and an ArrayList:

• Linked lists are more memory efficient than ArrayLists, because they only store the references to the next and previous nodes in the list. ArrayLists, on the other hand, store the actual elements in the list.
• Linked lists are slower than ArrayLists for accessing elements by index, because they need to traverse the list to find the element. ArrayLists can access elements by index directly.
• Linked lists are more flexible than ArrayLists, because they can grow or shrink as needed. ArrayLists have a fixed size.