I've used both and i prefer the Ti-10 (2nd gen/yellow). I suspect it may be because I have not gotten used to the arc10 yet.
i have an arc10 3UG4 and ti10 3UG5(3rd gen) and i would say the Ti10 has more power. power depends on various things. i like the ti10 more but that may be the speed i swing. theres an article about it racquet stiffness and the swing speed.
Ti-10 has better power, Arc 10 has better defense and manuveribility result may vary and this is my personal feel....
ARCH 10 is better for me both power and defense.. Net play and dropshot Ti10 purple have better performance..