Either way, this isn't about what's the best method of locomotion, but rather what exercise has the most bang for your buck between sprinting and jogging. I think we should all be mature enough to admit that there's space for both sprinting and jogging (and obviously walking) when it comes to human locomotion. There's absolutely no need to determine a "best" because we employ all of them.
Sprinting is my downfall, I haven't been able to stick to a once a week routine for more than 2-3 weeks before I "forget" to do them... I really should since I don't really have a lower body routine at the moment. My conditioning in that area is pretty horrible too, I can hardly do 5 uphill sprints now before wanting to go home and ball up. Ideally I'd do my sprints via a sport such as soccer, so I'm looking for an outdoor league or something to join.