Very few people rack to a secondary these days with any style of beer. The main reason is the risks outweigh the benefits. The fact that you have shouldn't make too much difference but the risks are (not necessarily in order) picking up oxygen (beer is like an oxygen sponge), infection and risk of fermentation by-products if fermentation wasn't 100% complete, mainly acetaldehyde and diacetyl. This compares to the risks of keeping it on the yeast of which the main one is the yeast autolysing. It actually takes a lot for yeast to autolyse, usually some sort of catalyst to start the process of yeast dying and cannibalizing such as salt (used in the production of Vegemite)
As soon as your stout is 100% fermented, you can leave it in the primary, drop the temperature and hold it for a week or two or until the yeast has dropped. Then bottle and allow it to condition in the bottle. Bottles will age faster anyway because of their small size.