Help me chose my traveling companion (Laptop)

I need to get a light laptop to bring along to classes and home during breaks.

My only requirements are that the laptops be light, have long battery life, and can play Dota 2 and/or terraria

Would you go for either the Haswell Lenovo Yoga 11s $799


Apple Mac Book Air 11" $849

I have owned a mac before but switched over to a PC, currently using a heavy Sager, when I started gaming. I now need something portable however and am stuck between those two.

I've also considered getting the 14" HP Chromebook but the inability of replacing the ram ruined it for me

let the opinions flow, preferably with a reason as to why

Thanks all