Modern men's slim fit shirts are well known for their tight, close-fitting cut ergo it should go without saying that slim fit shirts are recommended mainly to men with more sport-like physique as they are prone to highlight one's figure very well.
However the small disadvantage is that one can feel slightly uncomfortable when tying shoelaces and such as the slim fit shirts don't lend much additional space for stretching. That's the occasional price you pay for perfectly fitting, stylish look though.
Great plus about the slim fit shirts is also the fact that you can mix them with pretty much any reasonable piece of clothing. They go well with suits, chinos and jeans.