I believe the Sabertooth has a 5-year Warranty which is one of the main reasons I got the Z77 version.
They emphasize the "toughness" of the Sabertooth Z87 though I really don't know if it would be more reliable. Regardless, they'll replace it for up to five years which you may or may not care about.
I have been recommending the Hero to many people as well; I'm not sure how much better the audio really is though it is a Realtek chip. Basically keep the Warranty issue in mind, and read about the differences from Asus' site. Have both sites side-by-side and flip back and forth.