If you need to statically initilize something in a Class that means there must be client classes dependent on that.
If there is one client, or let's call it a natural home for the initializing block, I think it would be cleanest to initialize it there.
For the many equal clients case, it may be a good idea to verify from these classes that the static initalization in the other class was successful. Then the coupling is documented and you are sure the class is always initialized before the first client needs it.
