I would choose the first week (actually we are going the first week and running the 10 miler that weekend).
Run Disney events don't necessarily make the parks more crowded but the race will effect transportation on Saturday night and Hollywood Studios will close early to the public that night.
With Columbus Day making for a long weekend and some schools having a fall break, the parks will be more crowded the second week.
Our Authorized Disney Vacation Planners are here to provide personalized, expert advice, answer every question, and uncover the best discounts.
Let Dreams Unlimited Travel take care of all the details, so you can sit back, relax, and enjoy a stress-free vacation.