Straightforward vs. Structured, Non-repetitive Code: Which Would You Choose? (DB-Backed Set)

It is not always clear which code is better or worse as it might depend on the needs and the team in question. Let’s have a look at two different implementations of a database-backed Set, one that is straightforward and easy to understand and another one that has more structure and less duplication at the expense of understandability. Which one would you choose?