Pro classes - you are in the same small group (maximum 3 students) as the teacher for the full hour. You get lots of feedback and interaction from the teacher. Video is on. There are different games and images to speak about. Best for learning and fluency.

Regular classes - the teacher splits their time between several small groups of 3 students each. E.g. you would be with the teacher for 20 minutes, and for the rest of the class you will be practicing with the other students for the other 40 minutes. Best for confidence and practice.