I would say light then heavy. If your strength is there, but there is no size; try HST. Contrary to what most people say, I have noticed strength gains already on my first cycle. It does build strength, just not completly optimumly. So if you wanted to put on some size, just do one HST cycle. Then you could work on your strength with another workout after the HST. Maybe you will enjoy HST so much that you will keep with it.
I really hoped this helps.
CwC