TINs use vector (point) data while DEMs use raster (grid) data. The most noticeable differences between the Tin and DEM is some of the contour lines on the TIN produce sharp edges that do not close while the contour lines on the DEM are smooth and continuous. The areas where the contour lines are closest together (steepest) show the smallest amount of differences between the TIN and DEM. I infer that the DEM contour lines are more accurate because they have the advantage of containing more reference data.
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