We present a comparison of two interferometric methods to perform a form inspection of a cylinder lens with a single measurement. The first method, Multiple Aperture Shear Interferometry (MArS), is based on the measurement of the coherence function by means of a shearing interferometer. It allows interferometric measurements by simultaneously using several independent, partly coherent light sources, and enables thus a flexible lighting that can be adapted to the specimen. The method is compared with Computational Shear Interferometry (CoSI), which allows to measure wavefronts. Since both measurement methods rely on a shearing interferometer, a direct comparison under identical environmental conditions is possible.