Is a timing chain better than a cambelt?

I am thinking about buying a newer car. It has a timing chain which needs no maintenance or replacement apart from regular engine oil changes. Many of the cars I am considering have engines with timing...

Is it worth fitting a new water pump while having the cambelt changed?

I have a DS3 1.2 PureTech 110. It's a 2016 and has done 52000 miles so I am booking it in for cambelt change. Should I have water pump changed as well?