Buying from a lesser producer in a great vintage is a bit like buying a bottle of Cold Duck in the hopes it will become Krug in the fridge while you’re sleeping.
It’s interesting, but my quick gut response was that Bordeaux is the only place that I would take vintage over producer. And La Lagune 82 was one of the wines I thought of (I think it was $15 futures at the time). It’s complicated by the issue of what is truly a great vintage. What’s a great vintage in burgundy? Is 2002 great? Is 1990, where there have been a number of disappointments, great? what do you do with 2001, which was initially an "off’ vintage, but now contains many wonderful wines?
That’s funny that anyone would call 75, 85, and 88 “off vintages”. When they came out they were each thought of as excellent vintages. Since then, many have considered 75 and 88 perhaps too tannic, while some say 85 lacks the structure of a excellent vintage.
To the original question: It matters whether that producer has tended to produce excellent wine in off vintages. I would certainly buy off vintages (at a good price) from Latour or Giacosa, but not necessarily from an arbitrary great producer.
If you are asking would I rather have a cellar full of “great” wine or a cellar full of “good” wine than I think you know the answer, even if it was at the expense of quantity. If it is a one time purchase than circumstance has to come in to play. In general, however, with the state of the wine market these days I’m not sure this is a decision that I am forced to make all that often. There are still numerous deals to be had out there and lots of old vintages (great and lesser) to be had for excellent prices out there.
But I think the biggest factor is maturity. I will choose the lesser producer/vintage 9/10 if it is a young wine (especially off of a restaurant list) and I am drinking it immediately.