I am not support, but I will say that the local displayed (console) hashrates do not always tell the whole story.

A better test would be to run each client for 24 hours on a pool and see how they stack up in terms of shares submitted and income. Ideally you would have two identical rigs that have performed similarly in the past, so you could run each client at the same time to try and reduce the external variations (network hashrate, pool luck, etc.) that happen on a daily basis.

But my main point is at the end of the day it's the number of shares submitted and accepted by the pool that pay your bills, not what the local miner console displays.