If you compare it to the FreeMacSoft AppCleaner app I think it improves on a couple of areas in regards to trust. Who is FreeMacSoft really? There is barely any info on their website, Pearcleaner has a real person behind it with their name attached to the project.
The only thing that I think they could improve on is notarisation of the app but that does cost money so I can understand why an indie dev might not want to invest in that.