Insight from Jeremy Anderson on Backswing.com:
Both are important in their own ways.
To dial in your wedge shots both are important in their own ways. Number one is control the length of your hand path. Length of the actual range for the head of the club is less important… Number 2 is tempo… It is easy to create more ball speed with faster tempo.
Play from the proper tee box and get regular lessons.
Play from the proper tee box and get regular lessons. If you work on the right stuff you hit better and play faster.