I think it would be really difficult for me to choose one or the other. I work in a highly brain-taxing field, so for me losing too much cognitive function would make it very difficult to keep my job. On the other hand, my lack of mood stability has wreaked havoc on my ability to do my job as well. So it's a matter of striking that balance for me, one that gives me enough of each, so that I can continue to function well enough at my job (and in the rest of my life).