Capabilities of various Magnetotelluric transfer functions in monitoring the resistivity structure of the sub-surface have been compared throughout this article. To achieve this purpose, First a synthetic model representing the geoelectric structure of an Enhanced Geothermal System has been introduced. Secondly, Various MT transfer functions are calculated for this model using forward modeling. Eventually, Pros and cons of each transfer function are discussed. The results show that residual phase and residual apparent resistivity tensors are capable of detecting the changes, even if the changes are too small. Monitoring such small variations in the sub-surface in the presence of noises demands the improvement of the spatial resolution of the MT method.