I have not compared all the permutations but others have (well maybe not all but enough to be able to draw some conclusions and vote with their wallets).
Afaik the price difference between Vivaldi and Rossini DACs is greater than that between the clocks so the sound quality improvements have to be judged relative to the respective price tags. But I would still say it is worth auditioning (if possible) rather than just assuming based on some theoretical rationale.