Asus' Zenbook UX305 is thinner, lighter, and has a better screen than the MacBook Air, according to Gizmodo's review. It's cheaper than the MacBook Air and Dell XPS 13 at just $700, while its aforementioned competitors start at $900 and $800 respectively.
There are a few areas where the UX305's more expensive rivals outshine it, but Asus has made sure all of the important features are spot on: storage, screen quality, and battery life. The UX305's screen is sharper than that of the MacBook Air and it still boasts long 9-10 hour battery life according to Wired. It doesn't have a backlit keyboard and isn't quite as polished as the MacBook Air or Dell XPS 13 in terms of design, but it's a tough value to beat.
Price: Starts at $700