Short answer...Ranpage V Extreme
Long answer:
Not as clear cut as it seems. If you are going to be OCing and want top performance at the cutting edge end then I think the RVE is where it is at. However if you are going to be "normal" OCing for gaming and video encoding then both will serve you almost equally well.
For me the RVE BIOS and functionality make it a great all round board for everything. Gigabyte and MSI BIOS not so good for me.
Customer service depends a bit on where you live but for many it is a complete nightmare with ASUS...a big minus when/if you have problems and pretty important.
I have had MSI X99 Gigabyte and RVE I still have the Gigabyte as spare but RVE keeps me coming back and keeps me OCing
Cache OCing in particularly the other boards don´t get to the same level...