In the many years we have supplied label sheets to retailers like yourself we have encountered several different printers that perform well and others that do not. However, in my experience the brands and features that generally perform best are those manufactured either by Hewlett Packard or Brother.
Our advice is to avoid all in one printers and limit your search to only single function, medium duty monochrome laser printers. We would also highly recommend that you locate the printer’s manual online and insure that the printer you are considering has a specific configuration for printing adhesive labels. Very often label printing issues can be corrected by properly configuring the printer for this function.
These are our recommendations and we hope they are helpful. Please do not hesitate to reach out to us if we can be of any further assistance.