Some people are compulsive planners while others like to go with the flow.
Which is better? It depends on the task at hand. A balance between some planning and some going with the flow can work well.
A little bit of planning makes you anticipate the task at hand, thus you are more prepared and efficient. However, there are times when you have to take advantage of the opportunity in the moment.
If you can use both skills at the right time, you can walk away with the best of both worlds!