The important difference is in the amount of padding and upholstery. The Capisco Puls (partially and fully upholstered) have a modernized, molded polyurethane seat and back, and a slimmer saddle that allows you to sit with your legs closer together.
The partially upholstered Puls features a strip of padding in the center of the seat, while the fully upholstered Puls has a fully padded seat. Both versions feature a plastic backrest.
The standard Capisco features a fully padded and upholstered seat and backrest available in a variety of upholstery options and colors.