For me, it would have to be Persona 5. Launching an all-out attack after a string of knock-downs is supremely satisfying ( though I still prefer the sheer ridiculousness of a 10+ combo in Tokyo Mirage Sessions). It really is a shame there aren't more turn-based RPGs like that.
If we're going for real time, I'm a little torn, though I'd like to give a shout-out to Horizon: Zero Dawn, Breath of the Wild, and Yakuza 0.
Edit: Nioh is pretty good, as well, but I'm nowhere near skilled enough at that game to be able to adequately assess its combat system.