iPhone 4 power adapter

[paulalex93]

Hello! I am from Europe and my power adapter just crashed. I went to a store to order a new original one and the lady there offered me 2 options:
the A1300 model , which is like the one that my iphone came with;
and tha MB051ZM/A model which is the kind that the first iphones came with , that big one.
Which should I order?

 

[Gjwilly]

Both are fine for the iPhone but the big one can also charge an iPad (5W vs 10W).
If you don't have an iPad then why bother with the big one?