If it is true both that active choice is possible in a situation 'when acceptance is involved' and that choice is difficult 'when acceptance is not involved', then from the perspective of decision theory, which selection criterion is the most rational?

First of all, since I affirm only a very limited possibility of human rational capacity, I hold a fairly deterministic view, and so the rationality I have in mind is quite far from the rationality of decision theory. I think every decision made by any intelligent system in a given situation is rational. Generalizing its past decisions, an individual makes the best judgment within the framework of understanding it has built as well as it can, so I consider it rational even if, from the perspective of a third party, it is inefficient. By the way, I don't know what the question is asking. If both claims are true, they don't conflict, so why ask which one is more rational?