I tested all of these services, and then cross-checked that with reviews and Consumer Reports’ report as mentioned above.
We also did a more extensive test afterward which ended a few months ago, but we only wrote up the final article and published it today, so here you go: EasyOptOuts Review & Real-World Test - Privacy Guides
Mozilla Monitor Plus is not an independent service, but a white-labeled version of OneRep.
OneRep has notable controversy surrounding them that would make me avoid recommending them.