I don't have NS9000 Type X, but I do own a BS10 and NS9900 (sold). I would say both rackets perform pretty much the same. The only thing I "feel" different is the overall weight of BS10 is slightly heavier.
lol, i don't have bs10 but i have the others and if you say that bs10 is slightly heavier probably due to the balance, then the stiffness of the bs10 is quite stiff, and that it is probably on par with ns9000x. side track: now i'm just wondering if the bs10 is that stiff because that would be a very nice racket since i hate the flexibility of the bs11!!!
Lol, I guess our combine post answer OP question. side side track: want my BS10? pristine condition: total court time less than 24hrs! (also have a BS15 as well).
I haven't used BS10, but have played a hell lot with NS9000 Type X. This racquet makes me a more defensive rather than attack. I used a 2U-G4 version of this racquet with NBG98 string. Clears, mid court rallies and net shots are spot on with this racquet. However you will suffer in the attack department - smashes & net kills. You need to get the timing right with this racquet to ensure effectiveness of your smashes or net kills. Otherwise these shots would be easily returned by your opponent.