Vader is not only my favorite villain of all time, but might very well be my favorite character of all time, so the more vader the better and I really like the rogue one vader. That's the vader I want. Up until this point, Empire vader was the one I loved the most:
Episode IV - He's kind of Tarkin's bitch. Sure, he busts stuff up, but I always feel that subordination to tarkin
Episode V - Total badass, murdering everyone that get's in his way and kicking ass. Besides that one small call to the emperor, he answers to no one and he is in command, making strategic decisions.
Episode VI- He's the emperor's bitch, docile and subordinate. He just kind of hangs out on the command ship. Not feeling it
So its nice to get the badass, independent vader back on the screen. And yeah tarkin dispatched him, but this time, he felt like he was doing his own thing.