Well, how do you do things? Are you a prepared person or a fly by night person? Do you take 10,000 word notes in class everyday and transcribe them into a massive notebook every night or do you just scribble down things that sound important? Do you spend 72 hours studding for a test or just casualty flip through notes and the book the night before?


How good are you at Improvisation? Can you think up of a character's history in less then two minutes? The history of a dwarven empire in less then ten? How fast can you create a simple encounter:time yourself making the classic 'monster guards a chest in a 10x10 room'. How long did it take for you to make that encounter? Was it any good? Was it interesting and exciting? Do you think your players will be talking about the 'chest encounter' for years to come?

Unless you already feel like your great at Improvisation, you should stick to prepared. So, you should plan a lot. After all even if you don't use the plan, you will still have it. But if you get stuck in a jam with nothing, and have nothing to go on...well....