I do cardio and strength on alternate days and take a rest day when I need to. I think that I have gotten more results from the strength training BUT you have to have both because each contributes to the success of the other. For example, my lower body strength training helps me to run faster and longer. My goals are to maintain my weight but lower my body fat. I am short and stocky and the weight training has definitely helped my body to look more toned but the cardio is what's helping me maintain my weight. Also, more muscle mass increases the calorie burn as well, even at rest so that's probably helping as well.
--Lois
"If I have the belief that I can do it, I shall surely acquire the capacity to do it even if I may not have it at the beginning" - Mahatma Ghandi