I've been using Paw ( https://paw.cloud ) for a while, which I guess is just a slightly more advanced version of this. Lets you sync state across team members etc which is handy.
But, the functionality of Paw and Proxyman are completely different. Paw is an advanced API tool for Mac -> Help you to construct the Request and test it. On the other hand, Proxyman is MitM, capture all traffic from the device, intercept it and see the HTTP/HTTPS Request and Response.