travel from Jiuzhaigou to Aba or Songpan

Hi,
I was curious about how to get from JZG to Aba or Songpan. I know there is a bus from JZG to Songpan but do you know how much that costs and how long is the trip? Also is there a direct bus from JZG to Aba? If so how much is that bus and how long? There aren't any train station in either place right? Lastly... and sorry for so many questions.... what would you recommend, Aba or Songpan? I will be traveling on my own in Mid July if that helps. THANKS