If you do not know yet, there is an appointment for that.
Online booking asks for a service, and that is exactly where many first appointments fall down. If you are unsure, choose the first styling appointment: we call you beforehand, talk about your goal and plan in the right person with enough time. The appointment costs CHF 240, for men CHF 98 to 135 depending on the level.
If you prefer to narrow it down yourself, answer three questions in the Style Finder and it suggests a service and a person for you. Neither replaces a look at your hair, but it takes the uncertainty out of the booking.