维基百科上有很好的章节介绍了它们的区别。

Linked lists have several advantages over arrays. Elements can be inserted into linked lists indefinitely, while an array will eventually either fill up or need to be resized, an expensive operation that may not even be possible if memory is fragmented. Similarly, an array from which many elements are removed may become wastefully empty or need to be made smaller. On the other hand, arrays allow random access, while linked lists allow only sequential access to elements. Singly-linked lists, in fact, can only be traversed in one direction. This makes linked lists unsuitable for applications where it's useful to look up an element by its index quickly, such as heapsort. Sequential access on arrays is also faster than on linked lists on many machines due to locality of reference and data caches. Linked lists receive almost no benefit from the cache. Another disadvantage of linked lists is the extra storage needed for references, which often makes them impractical for lists of small data items such as characters or boolean values. It can also be slow, and with a naïve allocator, wasteful, to allocate memory separately for each new element, a problem generally solved using memory pools.

http://en.wikipedia.org/wiki/Linked_list

另一个很好的原因是链表非常适合高效的多线程实现。这样做的原因是，更改往往是局部的——只影响数据结构局部部分的插入和删除的一两个指针。所以，你可以让多个线程在同一个链表上工作。更重要的是，可以使用cas类型的操作创建无锁版本，并完全避免沉重的锁。

使用链表，迭代器还可以在进行修改时遍历列表。在修改没有冲突的乐观情况下，迭代器可以在没有争用的情况下继续。

对于数组，任何修改数组大小的更改都可能需要锁定数组的很大一部分，事实上，这是在整个数组上没有全局锁的情况下完成的，因此修改会停止全局事务。

合并两个链表(特别是两个双链表)比合并两个数组快得多(假设合并是破坏性的)。前者取O(1)，后者取O(n)。

编辑:澄清一下，我在这里指的是无序意义上的“合并”，而不是归并排序。也许"串联"这个词更合适。

It's easier to store data of different sizes in a linked list. An array assumes every element is exactly the same size. As you mentioned, it's easier for a linked list to grow organically. An array's size needs to be known ahead of time, or re-created when it needs to grow. Shuffling a linked list is just a matter of changing what points to what. Shuffling an array is more complicated and/or takes more memory. As long as your iterations all happen in a "foreach" context, you don't lose any performance in iteration.

对我来说是这样的，

Access Linked Lists allow only sequential access to elements. Thus the algorithmic complexities is order of O(n) Arrays allow random access to its elements and thus the complexity is order of O(1) Storage Linked lists require an extra storage for references. This makes them impractical for lists of small data items such as characters or boolean values. Arrays do not need an extra storage to point to next data item. Each element can be accessed via indexes. Size The size of Linked lists are dynamic by nature. The size of array is restricted to declaration. Insertion/Deletion Elements can be inserted and deleted in linked lists indefinitely. Insertion/Deletion of values in arrays are very expensive. It requires memory reallocation.

除了插入和删除方便之外，链表的内存表示方式也不同于数组。对于链表中的元素数量没有限制，而在数组中，您必须指定元素的总数。 看看这篇文章。