The sentences are mine.
There will always be situations in which you'll be able to use one option instead of the other.
There will always be situations in which you'll be able to use one option instead of another.
Does sentence 1 imply that there are only two available options?
Does sentence 2 imply that there are a few available option (or at least more than 2) and "another" can be understood as "any other option"?