Imagine you're in a CD store that really does sell everything without even having to order it (!!) when someone comes up you and says:
"I have just enough to buy 2 CDs, which don't have to be recently issued but do have to be symphonic or choral. And I want one that's unsung by an unsung composer and another that's unsung by a well-known composer. What are your top 2 recommendations fitting the bill, including why you think these are such great works and performances?"
So, what would you say?
I suppose this is cheating, but in real life I would ask him or her what composers or period they like most, because otherwise my brain would probably short-circuit.