How to manage a lab session

Today, Kinki and I have a long discussion on providing feedback or assistance to students during a practical session.

There may be two possible choices for us:
1. Provide immiediate feedback to student who is asking for help and then handle the next one by one. (similar to real time processing)
2. Collect requests from all students. Set up a waiting list and schedule your work. (similar to batch processing)

Which one your prefer?