The trend towards inverter-based resources increases the need to enhance power system stability. Besides steady-state voltage support by providing reactive power, compensation systems should provide inertial frequency response and short-circuit contribution. In this paper synchronous condensers, static synchronous compensators, and static VAR compensators are analysed regarding their suitability to achieve that. While the latter two show benefits regarding voltage and reactive power control, synchronous condensers stand out when it comes to inertial frequency response and short-circuit contribution. Thus, different technologies should be considered complementary when planning compensation systems to stabilize the power system.