The real difference is in the quality of the ingredients and how they were gathered and assembled. Many commercial incense brands use the cheapest ingredients they can acquire, and most customers buy the cheapest brands. Thus, the results are also the poorest.
You can use whichever delivery method you prefer (oil, or resins, herbs, etc). There are valid reasons for each.
“Nothing is easier than self-deceit. For what each man wishes, that he also believes.” —Demosthenes
"Do not worry; cultivate the habit of being happy." —Samael Aun Weor