http://www.overclock3d.net/reviews/cpu_mainboard/msi_z97_gaming_6_review/10
The ranking is based on setting the board which recorded the highest combined fps in the gaming tests at 100% and ranking the others by fps as a % of the fastest one.
MoBo % of Leader
MSI Z97 Gaming 9 - 100.00%
MSI Z97 Gaming 5 - 99.86%
MSI Z97A Gaming 6 - 98.96%
Asus Z97 TUF Sabranco - 96.13%
Gigabyte Z97X Gaming 5 - 95.00%
Gigabyte Z97X SOC Force - 94.95%
Asus Z97 Maximus VII Hero - 93.67%
Asus Z97 Maximus VII Formula - 93.58%
Asus Z97 Maximus VII Gene - 91.69%
Asus Z97-A - 89.57%
MSI Z97 Mpower MAX AC - 88.20%
MSI Z97S Krait SLI - 71.01%
Another ranking appears below .... based upon which boards might be best avoided. The % listed are the percent of board owners who posted highly negative (1 egg) user reviews.
MSI Z97A Gaming 6 - 33%
Asus Z97 Maximus VII Gene - 10%
MSI Z97 Mpower MAX AC - 4%
MSI Z97 Gaming 9 - 41%
Gigabyte Z97X SOC Force - 28%
Asus Z97 TUF Sabranco - 9%
MSI Z97 Gaming 5 - 15%
Gigabyte Z97X Gaming 5 - 15%
MSI Z97S Krait SLI 18%
Asus Z97 Maximus VII Hero - 19%
Asus Z97 Maximus VII Formula - 26%
Asus Z97-A - 26%
8 SATA Ports is rare.... most have 6 and you can lose 2 of those when using M.2
The ones with 8 are more expensive and most have vanished from store shelves.
Gigabyte Gaming 7 and Gaming Gt
MSI Gaming 9 and GD-65
Asus Hero
The MSI Gaming 9 has 8 rear USB 3 ports but again, going to be very hard to find one