A friend has the harimoto and I have the Innerforce version. The harimoto is a little head heavy, great for blocking (I found korbel was quite head heavy too - around 93g), I prefer Innerforce slightly over harimoto , it's a touch faster and not head heavy. Both equal for control.
The nittaku acoustic inner carbon, great spin and slightly better feeling , but slower than the other two. I found with some rubbers a bit to much catapult on the nittaku , as fairly flexible blade, so worked better with firmer rubbers like dignics 09c.
For outercarbon blade the butterfly outerforce alc is quite good - designed to be not so fast. Or if you don't want to spend to much yinhe 01 pro - but it lacks the feeling of the korbel.
The sk7 ( I don't own) but had short hit with one, is more a bit solid/firmer than the korbel with a bit more speed.