I prefer the Non Touch because it's like a pocket reader with a 6" screen. It's small and lightweight and perfect for just reading.
The battery life isn't really a factor. 18 days is plenty and for storage I never use much because I keep my library on Dropbox and only download what I am reading what's next in my TBR pile.
You can also use the Kindle collections plugin with it. Something you can't with the Touch which allows you manage collections Easier and change the font and margins more to your liking.
I love mine and put it in a Marware Eco-Flip cover which makes it even better!