A query builder is much more flexible. For example, in some cases there might be an additional condition you want to add to the WHERE clause. You can't do that

A query builder is much more flexible. For example, in some cases there might be an additional condition you want to add to the WHERE clause. You can't do that with parameterized queries, so you'd have to make a new query for every possible variation. That may be fine in some cases, but it could become a maintenance headache in large project.