I like them both. High Reps because it's high reps/low weights. It's longer but has good premixes. I like the use of the stability ball in TBTs and the nice thing about TBTs is it moves quickly, so you almost get a cardio effect from it. It too, has nice premixes on it, as well. I use TBTs more often, but I am also doing my second round of the XTrain/LIS rotation and that uses the TBT workouts.