Go talk to the guys at the HST board, Blade especially (he's a big HST proponent and has been training/juicing for some time). Also, check out this thread in the FAQ forum.
HIT's just retarded, especially on cycle. You can handle so much more frequency/volume when on, it'd be a shame not to take advantage of it.
I would definitely go with the HST, I kind of doubt the effectiveness of HIT - doesnt seem like enough volume even when not on a cycle. You'd probably see gains with both techniques but with the HST, like goofball said, you should see great gains.