I mix it up a little and find both work, one thing AAP taught me was, if your lifting straight after if you hit a cardio session with 2 mins steady followed straight after with 1 min max effort x 4 times that's 12 mins total, I find this very affective and handy if your in a hurry. Apparently after a good lifting session it tricks the CNS into thinking you've done a full kick ass cardio session. But like FC says we are all different fund what suits you.
Good luck !!