nonce ms lower in linux then windows

My nonce ms speed on linux is 19 and on windows 34. Same cards same computer. 

Is it importend to have the lowest ms nonce speed or is mh/s more important?

The reason why i am asking is that in linux i get a lower nonce ms but also a lower mh/s

in Windows higher nonce ms and higher mh/s

The win in Mh'/s on windows is 31.2 compared to linux 29.3

and ms is windows 34ms and linux 19 ms