In my current grow, im using both. This is Hurkle CBD from TGA. Lst'ed my plant and topped her. Some people do it, some don't. I can count 14 bud sites in this plant, and more are coming from below. I wouldn't say one is antagonist to the other, they both can be combined for good results. But if someone pulled a gun and asked me, I'd say LST. Less stress, plants will grow bushier than just with topping alone, they recover in 12 hours at most with LST. With topping, you have to wait a few days for her to recover, but you get two colas. With LST you have to wait until lower growth catches up.
I will try LST only in my next grow and compare yields.