" I would say byakuya is more impressive and versitile with different forms of bankai, shikai, kido, shunpo techniques skill ect. Kizaru was less than impressive in the whitebeard war so far. The case for logia intangibility here would be mute since with a high enough reiatsu byakuya should easily be able to harm kizaru (probably similar to haki) and the same case could then be made that kizaru can not see or hurt kuchki as he lacks reiatsu.(only shinigami or humans with high enough reiatsu like sado can hurt or see shinigami) Byakuya with reiatsu in his blade (like kenpachi had in his blade to cut through ichigo's zanpakto) should be able to hurt kizaru as silvers blade did, in addition kido would be very useful. In terms of speed kizaru is lightspeed when in lightform (although yata no kagami against apu hardly seemed lightspeed) but when not in lightform byakuya would have the speed advantage. "
You can't compare reitsu to haki, they are two different things. Without haki, you cant harm a logia type fruit user. But it really wouldnt matter because technically Kizaru cant see Byakuya anyways.