Modern power grids incorporating inverter-based resources (IBRs) may be liable to persistent oscillations and instability incidents, which jeopardize the reliable operation of the power system. Due to the high number and the complexity of the involved components, an analytical stability assessment of modern power grids is infeasible. A viable approach is the impedance-based stability analysis (ISBA) using impedances extracted from manufacturer-specific electro-magnetic transient (EMT) models via frequency scanning. This paper reviews the EMT-level positive-sequence, dq-frame and αβ-frame frequency scanning techniques and compares their computational efficiencies. The impact of the model reference frame on IBSA precision is also examined on two test cases: I - a full-size converter (FSC)-based wind park (WP) interacts with transmission grid in the super-synchronous frequency range; II - a doubly-fed induction generator (DFIG)-based WP interacts with transmission grid in the sub-synchronous frequency range. Among the compared techniques, ISBA using dq-frame impedance models features the highest accuracy. However, IBSA using positive-sequence or αβ-frame impedance models is sufficiently accurate. The computational speed of the ps-scan is fastest among the presented techniques. Using αβ-frame models has the slowest computational speed and is, therefore, is not recommended.