If you want my opinion, they are other factors that are more important than the tube vs SS debate.
For example dual mono topology is more important for a good definition and instrument separation.
Also you should look reliability, no matter how good it is, if it fell apart or blow your hearing and/or you headphone diaphragms your screwed!
Musicality is subjective, and you may pay for a trillion dollars HIFI system and could dislike how it sounds while be adequately content with a modest setup.
My recent experience with my new gear just bought and freshly tested:
HD650 alone with squeezebox touch is very OK to listen to, but you cannot go deaf, the sound is loud but not extra loud. Disadvantages, the sound can get rapidly edgy, bass lacking a bit and trebles sibilants, but slightly, you won't even notice if you didn't know better.
HD650 with La figaro 339, sound is world class, everything is better, loud loud loud and smooth smooth smooth. Very relax sound even when listenning to Marilyn Manson while there is a grindy and agressive entertaining sound at the same time! That's the magic of tubes.
Note this amp is very transparent, not warm by any means unlike lots bad rap going on about all tubes related gear.
Don't ever buy a hybrid tube/SS, they are for posers.