George,
I had the pleasure of having both of these in my house at the same time to compare. While I might be biased slightly as the Cornwalls were mine, here is my opinion.
The Cornwalls are much brighter in the mids. The Chorus II is boomier in the bass and less bright. Together, they sounded great! The Chorus II while having a smaller footprint, requires rear space for the passive radiator. I don't believe you could be unhappy with either speaker. For all out dbl performance, the Cornwall wins. Let your ears be the judge, as what you listen to will make a difference (movies or music).