The Product Comparison module control allows the customer to easily pick and compare different products in a grid view. Set this module control to appear on the page for all users.
Any product attribute defined for a product that are marked comparable and published will also appear in the product comparison grid. To change the look-and-feel using a custom display template, set the Display template value from the Configuration > Product comparison menu. You can also limit the maximum number of items to compare at a time to better fit your template and reduce server load.