Beginners is for kids still needing to master the basics such as a stance, duck walk, or double leg. Experienced is for kids wanting to advance more beyond the basics and work a little harder.
If you're asking for Tyler I would recommend giving Experienced a try. You're always welcome to move back to Beginners if need be. If this isn't Tyler's mom, hopefully this was still helpful!
How do we know which group our child is in?