I'll try...
Starting with Topping...
Topping can be very easy for newer growers, top the plant, and you can get more top colas... using less plants to fill a canopy (properly done it'll look like a sea of green on top) Downside is that the plant can become too bushy, and an inexperienced grower doesn't know to de-leaf the bottom of the plant to prevent massive amounts of popcorn
bending/tiedown
This method allows you to bend your plants down to create more "tops" because all nodes end up level and start growing... similar to (sea of green), downside is that new growers tend to snap and break branches until they get a feel for it..., sometimes growers don't know which direction to bend the plants causing heavy growth in one direction... this method is also more work than topping but can create high branching and higher yields... deleafing also improves this type of grow... also.. this does not work on all strains... some plants will not add new heads just because it's main cola is lower than the rest... it's a genetic thing...
Sea Of green
Highest Yields with Lowest effort,
Highest Yields per year
(Leo don't like this one)... many small plants higher yields, less work less veg time, downsides include high plant count requiring more clones, and possibly resulting in higher criminal penalties if your over your state/county limits... other downside is very bad for new growers... they tend to veg too long and/or continueing to feed N in flower and growth gets to excessive and some plants overshadow others and kill them... this also does not work with all strains...
Screen of Green
Must Tedious Style of growing
Most Work
longest veg time...
Some of the Highest Yields per Square foot, some of the highest Yields Per light, highest yields per plant
(leo likes this one) Least Plant count for a higher yield for Strict Limits...
Very bad for new growers, new growers will snap branches all over the place, they will have too much N in flower, causeing excessive foilage, and they will not know to do a heavy deleaf under the screen... so yields would be bad for a new grower
some strains absolutely cannot do this method
Lowest Yields Per Year Per light... (I know someone's going to try calling me out on this one...LOL)