I think it depends on the rest of the circuit. A tube that might be overly bright or even brittle in one circuit can bring another to life.
Which direction do you need to go with it? I have really liked several. RCA cleartop side getter is one of my faves. Amperex bugle-boy is also nice, but it does tend to brighten up a little more I think. For a new tube I have quite liked the JJ. It all depends...
