A planner! Love to create my world. Love to dream up what happens next and go for it - planning it all out to make sure it all works. It doesn't! Going with the flow is wiser, for sure, as long as there's a clear direction where to flo towards and steps taken to get there somehow.
Planner hands down. I have tomorrows schedule written up in two places (a post-it note and my dayplanner). Then I have the next two-three weeks scheduled as well. Though I do leave a little room for issues that might arise.
I think I can do both, depending on the necessity. I'll do the detailed planning when the need arise or there is a request for me to do so. But, if someone else is doing the planning or the plan is to have no-plan, I will be happy to go with the flow.