There are no choices to be made, it's all or nothing. Tranquility helps concentration to arise. Dukkha itself can lead us to proper concentration if we handle it properly. But we mustn't reject it, thinking that it is a quirk of fate that has brought all this grief to us, or think that other people are causing it. If we use dukkha to push us onto the path, then proper concentration can result.
Right concentration makes it possible for the mind to stretch.
The mind that is limited, obstructed and defiled cannot grasp the profundity of the teaching. It may get an inkling that there is something extraordinary available, but it cannot go into the depth of it. Only the concentrated mind can extend its limitations. This is distinct from the way we think they are or might be, or as we'd like them to be, hopefully comfortable and pleasant. But rather birth, decay, disease and death, not getting what one wants, or getting what one doesn't want, a constant perception of what we dislike, because it fails to support our ego-belief.