Depends on the time of day.
The first few buses will go only to the MP.
From about 9 a.m. to 10 a.m., the buses will stop first at TL, and then go to the MP.
Sometime between 10 & 11, buses will start stopping at TL, MP, and PI.
After about 11, buses will go direct to the MP followed by PI, stopping at TL on the way out of DTD.
When all guests have left TL (figure around 1 hour after closing), buses will stop going there after PI (so, MP and PI only.)
Finally, sometime late at night (I think 11 p.m. but I'm not sure), MP service will be discontinued and buses will stop only at PI.
Planet Hollywood is right at the PI stop, but it's no too bad of a walk from the MP stop either. Most of the day, PI will be the 2nd stop.