There are justifications for using a directive rather than a regulation: (i) it complies with the EU's desire for "subsidiarity"; (ii) it acknowledges that different member States have different legal systems, legal traditions and legal processes; and (iii) each Member State has leeway to choose its own statutory wording, rather than accepting the Brussels' official "Eurospeak" terminology.
There are justifications for using a directive rather than a regulation (i) it complies with the EU's desire for "subsidiarity"; (ii) it acknowledges that different member States have different legal systems legal traditions and legal processes; and (iii) each Member State has leeway to choose its own statutory wording rather than accepting the Brussels' official "Eurospeak" terminology