I have been using PDF Xchange Viewer for years. I tried the newly free PDF Xchange Editor a few months back but didn't like it and switched back to the viewer.
I did the same for a while (though with the Pro versions). Editor felt like an unfinished product for quite a while. However, at one point they seem to have reached parity with Viewer, and then I found Editor to be superior, given its additional features.
Out of curiosity, what is it that you don't like in Editor?