Rogue One was the first time I feel like we got to see Vader as properly terrifying. That was my favorite appearance of his until Jedi: Fall Order came out, and omfg he is even scarier in that one. I love scary Vader.
Kenobi was hit and miss. There were moments like when he had Kenobi backed into a corner, then Kenobi lit a fire between them and escaped, like Vader couldn't deal with that? I feel like he would have like parted the flames or tried to pull Kenobi into them or something. He just let him go, but then we see him indiscriminantly killing people in the streets and it's like, "okay, there he is."