I need to move 50 people from Putian to Xiamen and back for meeting. Is bus better or train?

Hello, I am taking about 50 people back and forth from PT to Xiamen for a meeting. Is the bus better or the standard train or bullet train? I want to look for the most economical solution, but do not want to waste everyone's time on the transit. Are there local companies that specialize in coordinating this type of event? Thank you.