6922 is more refined, smoother more musical than the 6h30. The 6h30 can also be call supertube is more dynamic and transparent but not as much musical and smooth as the 6922 and sometimes is very dry and analytical. Also there is so much more choices for the 6922, if you are chosing the 6h30 tube you will be stuck with them since there is no choice to roll the tube.
