I'm personally using the remote that came with my Samsung Smart TV. It looks very similar to this:
Finally! Easy navigation within Channels by programming the directional pad and DVR controls with AppleTV. As stated on this forum a few times, any universal remote can work...find what works best for you. But the experience for the wife and I is much easier using the features on the remotes that already came with our TV that have better ergonomics in your hands.
Just thought I would pass along my experience