As a commander I would want to delegate as much as possible in an emergency. Given that both pilots are well trained and that there are no doubts that the F/O will be able to execute the landing, I reccon the commander is better off having a slightly reduced workload so as to have a better look out and a better overall situational awareness.
I think the only time this relationship may be discussed is if the F/O shows lack of confidence or skills in handling the plane during normal circumstances.
I pilot with poor handling abilities will most likely (I have no scientific grounds for this) struggle even more with a crippled plane than with a fully functioning one. If this is the case, then perhaps the total team performance will be greater if the handling is left to the pilot with the best skills and all the rest is taken care of the non handling pilot.
/LnS