Yes Charge Q is an alternative method .to compute discharge time constants and associated losses for L and Fet. More specifically it is change in Q or change in CV, where Q and C are inversely related to Imax and RdsOn and volume of the junction., so SiN is better but cost more than Si and IGBT are preferred when ratings get over 800A and/or Volts some exceeding 1Meg VA product, but used for MegaWatt forward inverters and flyback for <100W.
Due to much lower RdsOn's this choice gets even more tricky....search those keywords...