I have to agree with DoggyDaddy but think I will add that as the QM I found I was able to perform most of the work needed on my schedule. As the Commander I found that there were certain functions and meetings that I needed to fit my personal and work schedule. As I work a full time job the duties as Commander probably made that position the more difficult of the two.
Both positions were rewarding ones for me and I found them to be equally challenging but in different ways.