hey man it depends where u growing how big ur place of growth is mine for example is very small im trying to get my plant as short and bushy as possible. You deffinently dont want your plant streching, the very best would probably be tall and fat!!
The short fat one has the better yeild because it has more budding sites. More budding sites = more bud. However taller plants that are less bushy finish faster and more can be put in less space. That's called sea of green (sog) and the idea is that 6 1" plants will produce as much as 1 6" foot plant. Check out the grow guide in sidicious's signature. Read it 3 times. It will do you a lot of good.