Belt: a moving path
A belt carries material on a moving surface. Loading point, length, incline and discharge point are considered together, including how the material sits on the belt.
Screw: moving from within
A rotating screw pushes suitable powders and granules through a trough or tube. Flow, stickiness and the required quantity matter. Not all powders behave alike.
Elevator: lifting upwards
Buckets lift material between levels. Height, bottom feeding and top discharge need consideration together. Selection depends on the material and entire line arrangement, not just distance.