I've experimented with topping versus LST and found I like LST much better. Doesn't stress or slow the plant, and you can keep doing it. Just by tying down the main stalk I ended up with 4 or so tops. Then you can keep tying down the taller ones to maintain an even canopy....or to keep the height down for either security or headroom issues.
The plants I topped stopped growing for a week, the LST ones didn't, kept growing. And the end result for me was a bushier plant, shorter and with more tops using LST