Selection of hand switch L05 and L06

A hand switch is commonly used in dental clinics for dental X ray machines. It can be used for remote control, so that dental surgeon can keep away from radiation damage.
For hand switch L05 hand switch L06, how to choose?

L05 hand switch and L06 hand switch appearance is similar streamlined design, comfortable and concise. The difference is that the plastic button is above the L06, the metal button is above the L05, and the L05 hand switch contains LED lights.