Thread update. I ended up getting both since one of my TVs is older and does not have HDMI connections which Apple TV requires. So now I've got Roku setup on the older TV and the Apple device setup on my newer TV. I have not downloaded anything yet on either TV.
Setup on both devices was pretty easy. Typing in passwords without a keyboard is a pain but at least you only have to do that once. Both devices are incredibly small and so are the remotes. I worry about losing the remotes because of their size.
I'm thinking we will sign up for Netflix and Amazon. The Hulu did not have much content if any that would interest us.
I'm looking forward to playing with both over the next few weeks and comparing/contrasting them.