x299 motherboards with tons of features: Asus vs Gigabyte vs Asrock vs ...?

Stringtheory

Honorable
Dec 3, 2014
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Are there any clear winners in terms of 'unlimited weight class' x299 motherboards? I'll spend whatever I need to in order to get good reliability and features.

Baseline:
Reliability
Max number of slots/channels for adding multiple GPU boards
Lots of I/O: Sata ports, USB, etc.

I used Asus for many years, but went to Gigabyte for a system that I built a few years ago, thinking that their tech support would be good and boards more reliable. It didn't work out exactly like that though. After a long phone hold recently, I got some naive misinformation from Gigabyte's tech about features on their x299 boards. And my current Gigabyte does not always boot, for some reason. Are Asrock and MSI in the running? I've never used either.
 
I'VE been looking at the Asrock X299 Taichi XE - the non "XE" model won the Tom's hardware award
basic difference is the XE model has two 8 pin power connectors
https://www.asrock.com/mb/Intel/X299%20Taichi%20XE/index.us.asp

only reason i like Asrock - i've built 3 rigs, 2 with Asus mobos and one with Asrock (in my sig)
Asus seems to shove stuff out the door and issue a Bios later - both boards had multiple bios updates and none seemed to cure all the instability issues. Then i learned Asus's AI Suite III performance utility created conflicts in their own BIOS - go figure
The Asrock board has not had one BIOS update since i've had it, and has been rock stable for the 2 years i've been running this rig

fwiw