Hello Jessica,
Thanks for stopping by with your question. Deciding on which parks to spend the most time in is an important step in the planning process, so I can understand your dilemma.
My family does not spend much time at Disney's Hollywood Studios because two of my kids are younger and can't really do many of the rides based on the height restrictions. They also aren't really into the stage shows, which Disney's Hollywood Studios has quite a few. However, this is the only park in which you can
"meet" Lightning McQueen and Mater. My youngest is a huge Cars fan, as well as Disney Junior. So, if you really want to see these characters, you will want to go to Disney's Hollywood Studios. Yes, there is Star Tours and the Star Wars themed retail shop at the end of the ride called Tatooine Traders, but you can easily avoid those two and still see so much more of the park.
I hope your vacation is filled with amazing memories.
~Allison L