Overall, it is seen that all the DFT-3c methods are performing well compared to the reference DF-MP2/aug-cc-pVQZ level of theory and can potentially be used as alternatives to the usually employed ωB97X-D3BJ/6-31++G(d,p) level for obtaining accurate cluster geometries, with a potential gain in computational efficiency. This gain in efficiency will be significantly improved for larger cluster systems, where the ωB97X-D3BJ/6-31++G(d,p) level of theory becomes prohibitively expensive. It should be noted that besides the geometries, the accuracy of the vibrational frequencies is also important as they are used to determine the zero-point vibrational energy and entropy contribution. Hence, to obtain more reliable free energies, a large scale investigation of the accuracy of the vibrational frequencies should be performed in the future.