I can tell you only in a vague way that different strains respond differently to training as far as improving yield....I think that's the question right? It would pay to check into what you are going to grow and see if it does well with things like topping, lst etc...
I personally have never had a problem topping and bending the different kinds I have grown BUT....I have not grown sativas so cannot offer any real opinion on how they do with training.

The other issue you have to consider with height is not how tall your plant gets but how much light you are getting to the both the upper and lower parts of the plant to ensure maximum yield. This is not easy to do with one light above a ten to 12 foot plant and that's where the issue comes of training often comes in. Rather than "space" issues its more a matter of "light" issues. Max lighting to all areas of the plant produce max yield.