Jiuzhaigou/Huanglong to Chengdu

Is there a bus from Huanglong to Chengdu?

I am headed to Jiuzhaigou, planning to see Huanglong and then going to Chengdu. Would you recommend staying in Huanglong for a night to see the park and then catching the bus to Chengdu from Huanglong (if one is available)?

Or would it be better to make a day trip to Huanglong and then leaving to Chengdu from Jiuzhaigou?

Thanks