I have played the Wessex, have never played an 842, but in this hypothetical I would easily choose the Yamaha for the reasons already shared in this thread. Plenty of top pros play the 842 and I have heard some wonderful recordings from folks, I especially like Anthony Caillet's stuff.
That is not to say that the Dolce is not a nice horn, because it is. But I agree the easy choice for me would be the 842.