Need some convincing to switch to Mac

I'm by nature a pc guy, but I already have a nice gaming desktop that takes care of all the power computing I need. I'm about to go to college and I initially decided that I could survive with my iPad for simple document processing and storing books but, I have now decided that was a stupid idea. I'm going to need a laptop for college, my budget would be at 1.1 k. My cousin recommended me a Macbook Air 13 because of the battery life but, I'm still on the fence. Tell me why I should make the leap to Mac instead of buying a nice Lenovo.