I prefer Sassie because it is easier to find jobs, see the status of assigned jobs, and check the status of payments.
For the job search, Sassie allows one to see a list or graphical display by map. One can change the radius and starting point easily. One can also sort the results in the list form by the various fields including client name or even shop fee. Shopmetrics allows one to see the shops by the default radius from the starting point, but only in list form. One can sort the shops by the fields, but it is not as intuitive as Sassie. Prophet's display of shops is by a certain radius that may include shops in your state, or not. When you search for shops 'outside your area' the result is often - You are not eligible for any shops. If you get results you can see, then they are listed only by city. Then you must click on the cities and ask it to display those shops. I find this method cumbersome at best.
Sassie also displays the current status of jobs in progress and payments better than the others. It's all right there to see in your job log. I do enjoy the fact that Prophet jobs seem to all be self-assignable.
Now that I think about it, I find Prophet companies lower on list of preferred MSPs than others. I think the easier job search on the other platforms (and some unique platforms for some MSPs) has a role in that. However, the fact that Prophet companies have less jobs in my area than others probably more of a factor.
Happily shopping Rhode Island and nearby Massachusetts and Connecticut