Debating between the ccminer-x64-2.2.2-cuda9 and the suggested nvida miner ccminer-alexis78-ms2013-cuda7.5

I get this with the alexis one.  Why is it reporting two different hash rates?  What are you guys using?

GPU#0:ASUS GTX 1080 Ti, 78.90MH/s
[2018-01-10 21:35:54] [S/A/T]: 0/3/3, diff: 1.387, 68.79MH/s yes!


Thanks,