Would the two sound different? Possibly. Would there be a $5K difference in favor of the Raven? Probably to some people and probably not to others. If you can finagle an audition; that's the way to go. Personally, I would go for the LaGrange in a heartbeat. Tonearm and cartridge are greater determinants of sound quality, IMO, especially when it comes to such state of the art equipment as these two tts.
Brinkmann La Grange Tube PS vs New TW-Acustic AC-3
Really, will I miss Audio Heaven by going with a used Brinkmann La Grange/Tube PS vs buy a new TW-Acustic AC-3. Same two arms, Dynavector and Graham Phantom. It' about $5-6K difference.