I am using ArcGIS 10.3 for Desktop.
We just have a project that require to create a pond. So I get to the field to collect survey points for topography and work expense purpose (we use volume of the land that had been removed to calculate the expense). I want to know the volume of land that were taken out so I created TINs and convert them to Raster (one is for the land before removed and another one is the raster of the land after it have been finished) and run cut/fill then the result give me about 57000 cubic metres but when I run Polygon volume (3d analyst) it gave me up to 82000 cubic metres for the same survey points and TIN interface. I used to use Polygon volume to calculate volume of reservoir of water but never experience with cut/fill but one of my friends told me that cut/fill method is more accurate with earthwork. As the results are not even near and I don't know the process of each function very well. I can't tell which one is the correct one. I am confused now.
Please help explain me with details.