I enjoy the ease of topping the 4th or the 5th node and then topping the side growth as it accelerates to reach the canopy and I can usually manage to get good production out of plants that have vegged for at least a month and a half and that have between 16-32 bud sites ready to go into flower. Other than playing whack a mole on the side growth as it takes dominance, there is very little training at this point... it is more about well timed multiple toppings.
Topping down lower produces interesting shaped plants that can benefit from a lot of LST training afterwards. Topping between nodes 3 and 4 produces an interesting plant that can immediately produce 3, 4 and sometimes even 5 main nodes from that single cut. It is also the cut that takes the longest to resolve. Each one of these new nodes can then be tied down and trained to produce a very wide and well producing plant, at a medium height.
Another interesting topping method is to wait until the 5th node is popping up, and then cutting way down low between nodes 2 and 3. This always produces 4 main kolas, which can be mainlined or quad'ed, allowing for a very high producing short plant, by holding down the 4 resulting nodes and using LST techniques to enhance growth in the middle. If you need a very short plant that is also high producing, and have some extra time to spend in veg, this is a very popular cut.
Enjoy! There really isn't a wrong way to do this.