I'm using both, but have split my daily apps between the 2 devices.
I rarely use email on the touch, but use Pocket Informant daily. Gas & Trip Cubby will stay on the Touch.
I do use it less, but it holds all my music and easier to carry some places.
My daughter is using hers wayyyyy less though, and I think it needs to get assigned to her sisters.... Who have misplaced their 32gb touch and won't be getting the 8 until it is found. Not a happy mommy at the moment 😡
But they fill different needs for me so i'm keeping both!