Все ведь написано в доке.
LinkedListLinked list implementation of the List interface. Implements all optional list operations, and permits all elements (including null). In addition to implementing the List interface, the LinkedList class provides uniformly named methods to get, remove and insert an element at the beginning and end of the list. These operations allow linked lists to be used as a stack, queue, or double-ended queue (deque).
HashMapThis implementation provides constant-time performance for the basic operations (get and put), assuming the hash function disperses the elements properly among the buckets

LINUXERИ почему я сразу не юзал HashMap=)
А если надо получать объекты по неуникальному имени, есть варианты кроме списка?
HashMap<String, List<MyObjects>> тоже вариант.