Will an 8 carrier braid sink faster than a 4 carrier braid, if comparing/accounting for an 8 carrier and a 4 carrier braid that have the same line diameter? Since an 8 carrier braid is smoother and more round than a 4 carrier braid, I would assume that an 8 carrier braid would have less resistance in the water and therefore should sink a little faster than the 4 carrier braid, right?

 

I know that a smaller line diameter will always sink faster than a larger line diameter, but I was curious as to which type of braided line would sink faster when comparing braided lines with the same line diameter and the only difference/variable between them was carrier count. 

Not appreciatively - difference between 4-carrier and 8-carrier is that the individual strands of the 8-carrier are thinner, which is why the finished weave is the same diameter.

Negligible in my opinion.