i tried both in their JP versions.. and i got to say it's a tough call the ti10 is very stiff, therfore very accurate... the mp90 is very good in it's power generation... so it all boils down to your game... aggresive = mp90... more control type, likes to move people around = ti10...
how about power? which is more powerful? and size of sweet spot? i tried mp77 and found it's sweet spot a bit smaller than the ti10, how about the mp99? how about shock absorption?
all my rackets are 2uG4... except my ti10SP, it's 2uG5... sweet spot and shock etc, i dont feel any difference...
i have both of them and prefer MP99(3u,g5/bg70@19*21lbs) than TI10(3u,g4/bg80@21*23). Feel easier to clear but not work properly (for me) for the net shot. Can creat more raq speed than Ti10 so it easier for me to drive against my opponents.