+1 for Asrock... and we've used several of their Asrock Rack motherboards at work in servers over the years and they have been rock solid even if they are missing a few features (compared to Supermicro and Tyan in the DIY server space).
My current desktop is based on a Asrock H97M Pro4 motherboard (8.5yrs old and no issues) and I've only heard decent things about them recently.
I will have to note, that they seem to have an A and B team in development that focuses on either Intel or AMD, so in some series of generations the AMD based stuff is top notch, but the Intel ones seem mediocre in the same year. (The Z190's/Z290's weren't great especially VRM design, but the same era AM4 stuff was really good). And a few years later, it seems to switch over (Intel boards had the A team, and the AMD boards got the B team), thus the quality/reliability of the boards swaps over.
IIRC, Asustek was a group of ex-Acer engineers who created the company in 1989, and then in 2002 spun off Asrock as an OEM to compete with Foxconn (Asus used Asrock to build some of their boards as an ODM/OEM), and then in 2010 Asus spun off another company Pegatron (as the ODM/OEM for Asus) and Pegatron purchased Asrock shortly after...