Asrock IMO/IME.
The Extreme I'm using now, has been running 24/7 365 for just short of 2 years now, and not A single Hiccup. Cleans well, PCB strength is great, Fan plugs,capacitors,and all other Plugs, and mounts are very well secured. Also the Push button release heat sinks on the chip set are nice for Cleaning, IF they are in Your way.Only REAL beef with My board is the Lack of PS2 support for BOTH mouse and keyboard.Has a dual, but Doesn't seem to Work for Me,but it seems as though PS2 is on it's way out. Decent bundle of built in features, LAN, Dolby, UEFI, are all good. Not to mention NOT having to sink $300 on a Board JUST to have it be dependable, and versatile.
The support, CAN be a issue depending on some factors. Their English Speaking staff were Few and FAR between when I had to RMA a DOA board, but after persistent communications, and patience, I was sent a new board WITH all accessories.Gb,Asus,MSI, All have something to offer, however, when I did My recent build Asrock had the MOST to offer @ a Lower price. For Me $ IS a Factor, and I'd rather use the Xtra on a GPU/CPU,etc. Warranty/quality/price. For ME in that Order when Shopping for a MoBo, or just about ANY other Component.
good Luck.