Athosanswered grow question 6 years ago Let's see. Yes you can do one or the other or as most do, a combination of various techniques, TOP, FIM, SCROG, DEFOLIATION, SUPERCROPPING and LST. As for the ones you ask for.
TOP'ing is very easy to do and then you forget about it. The cons is that it is a high stress technique, since you are wounding the plant and it takes time for it to recover (normally up to a week) and it is ill advised to do it in a plant already in 12 hour light schedule, since you risk it not recovering in time.
LST can be done at any point during the plants life, specially during the flowering stretch to keep the canopy even.
My advice, since you already put your plants to flower, try LST only; you could seriously hurt your potential yield if you TOP now. As an alternative to toping in flower, you could try to supercrop the main top: this is when you crunch the main stem between your fingers and bend the cola in a 90° angle, it's easy and can be done in flower, plus it has a similar effect as TOP'ing, as it promotes lateral tops to develop without loosing the main cola. I did it during my last grow several times during every stage of flower, to keep the plant height in check with very good yield results.