The geoinformation software market is becoming increasingly competitive. New improvements and tools are created, which are provided to the users with subsequent updates. Additionally, completely new software is appearing as well. Nevertheless, for the past several years, ArcGIS and QGIS have been the most popular software in Poland. There are many handbooks and manuals describing their possibilities. Both systems offer numerous functions. This does not mean, however, that the results of identical spatial analyses performed in ArcGIS and QGIS will be identical as well. The comparison of the results of such analyses performed on vector and raster data is the main objective of the conducted study. The research demonstrates, that selected analogical tools implemented in discussed systems provides different results especially in the range of spatial analyses performed on raster data.