Both are great speakers, I am a Vivid dealer, so you can take my comments for what they are, either biased or not, I can not supply you with speakers in Sweden anyway.
Here is my take on the two speakers both are fantastically well built products, both play loud and have great bass the difference comes down to driver technology.
Wilson is using a suite of very high quality drivers from several different manufacturers that represent some of the finest drivers made by their respective companies ie Focal, Scanspeak.
The Vivids use far superior driver technology that represent the life's work of the brilliant Lawrence Dickie who was the sole engineer who brought B&W back to prominence in the nineties.
Vivid is a much more technologically advanced loudspeaker than Wilson and uses many different techniques to lower distortion in a loudspeaker these include:
1: tapered tube loading
2: driver decoupling
3: cabinet designed as a bass trap to absorb low frequency energy.
4: non parallel cabinet construction
5: unique magnet designs designed to concentrate magnetic fields and lower distortion.
If you go to the Vivid website you can read about all of their technologies and patents which are numerous.
Now for the sound, the Vivids are faster and more articulate than the Wilson's and sound completely coherent as they use the exact same material for all drivers.
I still remember a demo done by Philip O Hanlon the USA importer years ago, when the Giya G1 rattled out ceiling lights at CES! I have never heard a speaker in that price range with the bass definition of sheer walop of the Vivid's if it was my money I would purchase the Vivid's hands down, they may not seem as exotic using aluminum for driver materials but if you look at the engineering rather than the specs you can clearly see that Lawrence Dickie is a loudspeaker design genius whose designs are advancing what state of the art really means.
Now I have sold Wilson's for years and they are excellent speakers and sound wonderful, it is my opinion that the Vivid's are an even better speaker than the Wilsons.