More marketable

A lot of work getting ready for running the Lego® STEM Challenge Club at the City Mission next week.  Due to the amount of students, several activities will run at once.  This means writing clear directions on how to run the stations.  This is taking a significant amount of time; however, it will make the club more marketable.  First, it can serve more students at once.  Second, with clear directions others can run the club without me being present.  Something great if Acts 2:42 Ministries has employees and/or more volunteers someday.  Here is one station that will run on its own.  Which launcher would you pick?