Is it better to choose a big vending machine or a smaller one and stock it more often?

The size of the vending machine you choose will really come down to how many employees or customers you expect will use it; too big a machine and stock sits idle and potentially goes off, too small a machine and you risk it running out of stock or having the hassle of constant refilling. So if you have a large market for your machine (and the space) then a bigger model, offering lots of choice and holding a good amount of product is advisable to maximise sales. However, for a smaller workplace, a  more compact vending machine may be more cost effective and reduce waste.