Out of shape - jog at a constant pace, or sprint/run until I get tired and then walk, then sprint/run again..?

So, I haven't ran in who knows how long, so I'm kind of out of shape, but trying to lose weight. Should I jog at a constant pace, or sprint/run until I get tired and then walk, then sprint/run again then walk, etc.? Which will benefit me more/burn more calories?