There is not enough information to make a definitive recommendation. I'd need to know the location in the building, the type of structure, what kind of supports are available, the floor loading, what other equipment is in use, environmental conditions (temperature ranges, humidity, seismic activity, air pollution control regulations and several other site factors) and how the materials are received and/or stored on-site. I've used pneumatic conveyors in some cases, lift-tubes (a variation of pneumatic) in other cases, and bucket elevators for others. Also, if labor is inexpensive and the material is received in bags, I'd use a freight elevator and have the material manually dumped.

The choice is difficult without having a complete picture.