My experience with Gygabyte motherboards has been great since they started the UltraDurable series. I've built several systems with them over the last few years and not had any problems at all with any of them. I've just ordered 4 more to replace all of my old ones in preparation for Windows 10, the oldest being about 7 years, which has been used daily for my personal computer.
As for Asus boards, I've had to replace 3 in the last 5 years or so for family/friends. Though I should say that that all of those boards were budget-boards. The higher-end boards might be better. I don't know.
If you decide to go with Gygabyte, you should consider one of their 'Black' edition boards. They go through a 168 hour burn-in test at the factory before being shipped off.