I listened to both again yesterday, although in different systems. With the caveat that I recognize that my perception of differences may have more to do with associated electronics and cabling than the speakers themselves my impressions are:
-- These are both great speakers and its a tough fight between the two.
-- The Vivid's struck me again as slightly punchier, especially in the low bass, and more transparent. However this came at the cost of the Vivid's sounding a bit edgier at times.
-- The Raidhos are also very transparent, but a bit smoother than the Vivids, without being warm. I am surprised by how much bass those tiny drivers produce, but it seemed to me just a hair less composed and tight than the Vivids.
-- The Vivids seem easier to position. The Raidhos seem to need to be close to walls and have lots of toe-in.
-- The Raidhos are much easier on the eye than the Vivids. Some may well like the look of the Vivids, but I dare say most will prefer the Raidhos by far.
Now...which to buy...tough...