Define "best".
If you use an agent, you'll pay 10-12% commission but will have someone holding your hand all along the way.
If you sell it yourself, you need to understand how to write a purchase agreement, submit for ROFR, hire a title company, etc. You'll also have to find yourself a buyer. But you'll save that 10-12%.
Depends upon whether you place a greater value on a speedy, hands-off sale or maximizing your return.