As a DEM user, how will using elevation data in GeoTIFF format be different?
Both formats give the user an array of elevation data, so basically there is no difference. However, it may be useful to refer to the USGS DEM format specifications and the GeoTIFF specifications. Since most software do not explain the process for conversion from DEM to GeoTIFF or vice versa it is important to synchronize the datum and projections of all data.