Let's assume I want to compare the nutrient content of selected beverages available on the market. The number of beverages is limited to about 10 items. The aim of this small project is to show that all beverages differ substantially with regard to a particular nutrient. I perform a descriptive comparison.
Should I provide trademarks (e.g. Cola, Pepsi, ... ) or should I call them "Item 1" , "Item 2", etc? I am asking because I am not affiliated to any company and this is not meant to be an advertisement. I received no money from any company and I have no conflicts of interest. I would like that to be clear for the reader.
Note: this is just an example. The real background is not about beverages but I selected that example for illustrative purposes. It is not meant to be a comparative study in a way of promoting a particular item but in a way of showing that differences exist and that the selection should be done wisely.