motherboards comparison for ethereum mining rig?

[SH_Storm]

howdy...
I need help regarding a choice for MB for a 6 GPU ethereum mining rig..;
I have a choice from one of the following MBs:
>> Gigabyte GA-Z97X-Gaming GT Socket 1150[/color][/font][/color]
    or
>> Asus PRIME Z270-P Socket LGA 1151
     or
>> Asus ROG STRIX B250F GAMING Socket LGA 1151

which is best to support 6 GPU cards?
if any bios modification/upgrade needed please provide details...

many thanks guys
have a good one