I don't think that you can fairly put reports in a particular category of difficulty based solely on the MSC offering them.
Yes, Coyle may have some long and involved reports. They also have some simpler ones. I've also done Merc restaurants that were equal to Coyle in terms of workflow.
These particular hotel overnights may be on the easy side, but the Coyle brand standard audits are 2 night stays that offer a fee and two meals, and essentially require no narrative reporting. You also get drinks at the bar and travel expenses/spa visit at the right properties. It takes some reading to understand the components but they are about the easiest hotel reports I have ever seen once you get them down. You get more hotel points with all of the food and two nights at the property as well.
Now, the amount of time it takes or desirability of the assignments is something that will vary between evaluators, but the lack of a fee is something that remains constant. Some might prefer less work and no money. I don't mind putting in work to get paid for my time....