For some people, a regular lift (elevator) is always going to be more convenient e.g. someone in a wheelchair, someone on crutches, someone with a mobility impairment, someone who's blind or has a guide dog. Even someone with luggage or carrying a box who can't see the floor in front of him.

A Paternoster is probably fine as long as there is also a regular lift somewhere in the building for people who can't use the Paternoster easily.