I would use your quick tracker. However, I have a mixed bootcamp class, so I track in two ways: 1, I enter the individual strength training exercises in the strength tracker for Sparkpoints. I also enter the total time in my cardio tracker, but only count calories for the cardio portion, which I track with a HRM. Like today, we did a mixed class of strength/cardio, but I only recorded 200 calories because that's what I burned during the cardio portion. :)
Note that my method ends up adding extra minutes, since adding an individual exercise in the strength tracker automatically adds 5 minutes to your quick tracker... I don't pay any attention to that number, though, so this works for me.