Here's where I stand with this subject after many years of hunting both deer & coyotes.
Coyotes will win the smell test. Hands down.
Deer have a keen sense of smell, but until you really get to know coyotes and study hundreds of them coming in, you really have no idea how well they really can detect smells.
You can continue to buy scent eleminator products, cover scents, etc.....BUT, if they worked very well on canines, the US Customs would be out of business with their dogs. 
To re-use an old comparison:
When you walk into McDonalds, you smell Hamburgers & fries.
When a coyote walks into McDonalds, they smell meat, bread, onions, sesame seeds, pickles, Dr. Pepper, and the new rubber smell on the sneakers the kid in the kitchen has on. 
While some products may appeal to YOUR nose, it won't even begin to give you the slightest edge in the field while hunting coyotes. That's a fact.
