I do cardio to lose bodyfat, have a healthy heart and all that, and build endurance. I usually do HIIT on my treadmill, but I go on different rotations with my stationary bike and exercise videos.
On the other hand, my hubby hardly does cardio and emphasizes PL and karate - he's 6'/265# now, down from 280#..but if we go on a long hike or walk he gives out sooner.