Dominated what exactly? A national team that has underperformed? Or are we just talking about the French league where he is in a midfield consisting of players like Veratti/Pastore and other star players.
Kante has dominated a better league, with better opposition, doing it with Drinkwater. Kante was a stand out reason why Leicester won the title and Matuidi as a player isn't better. His experience and reputation is.
France havent underperformed, and they are currently on their way to the semi's with him as the lynchpin. Enjoy you ignoring the CL.
Matuidi as a player is better. You've basically just used the prem as a reason, without once mentioning how that play. Matuidi reads the game better, is tactically active (he actually shepherds Kante under France, and marshalls the midfield, hes far technically adept, not just a runner, but carries from midfield, rarely loses the ball. Can play across the midifield and in any role. He's so adept he can play on the WING, and deliver cross after accurate cross. He's in effect a midfield general.