Difference between two arduino uno boards?

What is the difference between these two:

The datasheets show the same specifications but then the price and stock is different. Anyone have an idea?

As you can see from the pictures (and the description) one uses the SMD (surface mounted) processor and one does not. The SMD processor would be almost impossible to replace if you damaged it, whilst the socketed one is easily replaced.

Oh wow I totally did not even see a different in the pictures. Where is the processor in this one:

It seems to be entirely missing?

There it is! It’s just TINY.