I have made some test comparing miners Ethash:
Nbminer=93.79Mhs (Fee 1%)
Phoenixminer=93.3Mhs (Fee 0.65%)
Etherminer=92.72 Mhs (Fee 0%)
All : Core 0 Mem 1200 PL 215
For a big Rigs it is a big quantity of hash if we count the time that takes the change and the return of the DevFee.
It seems that best miner for Ethash now is Etherminer… If you are not able to run it, it is because you need to modify it and build it another time for the new Cuda 11.1. If someone need it contact me and I send it. firstname.lastname@example.org