Which is better : consultant or owner direct supervision ?

Direct Supervision, consultancy always comes with efficiency risks 

Consultant's supervision is more recommendable than the owner's direct supervision, because an owner can be non technical whereas a consultant possess the speciality of works.

Consultant supervision is better being more professional proven worldwide over last many decades. 

The consultant suppose to be much more technically professional but unfortunately now a days many holding companies, major companies, small companies, and owners look generally at consultants as no objection party.