A key is any set of unique columns. The primary in primary key just hints to the RDBMS how to store the data. Both URLs encode queries on the data. The first says "give me the 2023 review(s) of McDonald's in Berlin" (i.e., it has semantics) and the second "give me the row with uuid 1kjksdhh3244ygdvvgdd2345". I don't think the second URL is more robust because, for example, if the row has to be recreated it will fail to work.
You can change primary keys within a database but you can’t change them outside the database. A database is a map but keys are part of the territory.
The second URL with the UUID is more secure and is preferred in many situations where information leakage is a concern.
The first URL is more descriptive but more prone to breakage. It depends on the situation.