Show of Hands

Home Depot has their employees do online classes (which I doubt sticks), but they also deal with more customers who have knowledge/experiences that rub off. It really depends on which person comes across more knowledgeable.. If equal, I'm more likely

The employee's, most likely. But I'd consider what the shopper has to say. If the shopper can speak on the topic more than the employee did, I might reconsider. Otherwise, I'm going with the person that knows these products for a living.

Unless the random shopper is an expert in whatever you are dealing with, I'd take the employee's advice.