Hytron are pretty midrange focused but not lush. I would call the tung sol the warmer of the two personally. Not to imply the Hytron is dry sounding or sterile, it isn't. It sort of gives you another definition of neutral you might not have considered before, if that makes any sense.
NU 6SN7 are some of the most romantic sounding tubes you will find, very lush, very mellow. This comes at a price too. They have a pretty, colored midrange (that only works with some material IMO), but are soft sounding tubes with less detail than many other 6SN7s. Synergy matters with this tube too, it's particular colorations sometimes match badly with the existing tone of a setup, an vise versa sometimes can complement nicely.
As always YMMV.