Automatic release-
Pros: You don't have do anything more to your application. Cons: If you bomb, everyone knows. No givesies backsies.
Release at your discretion-
Pros: If you bomb, you get to hold off on release until after rank lists are made, potentially saving yourself huge stress and grief. Cons: You have to remember to press a button in the future.
You'll probably be fine no matter what, but holding off on releasing gives you options. In the wacky games of life and doctoring, options are your friend.