[erlang-questions] dict, orddict and gb_tree

[Ludovic Coquelle]

Hi,
Any resources/advices to choose between usage of dict, orddict and gb_tree?
In my understanding, they are all doing the same thing: "giving a key,
retrieve the value"; am I right?

If so, how to choose? I guess trees are better if there is few updates
(less than reads). And what about dict and orddict? What about any
criteria relative to the amount of data?

Please, some advice, I'm lost in the documentation :)