thee bottom line is - a combination of both with an emphasis towards inspiratory exercises

the most common problems are going to be atelectasis in dependent lung regions, decreased lung volumes and sputum retention.

all three will be targetted by inspiratory exercises and only the last by expiratory.

carry on with slow, deep inspirations with inspiratory hold, positioning (though nothing's better than mobilisation) and supported huffing and coughing.

too much huffing will just be going against what you're trying to otherwise achieve, so limit it.