Derby and Oxford are the lace-ups more worn and loved ever. Distinguish between the two models allows to know the degree of formality of the outfit and, therefore, be always on top on each occasion.
We start from the model Derby. This shoe, ideally if we remove the laces, we can slide a finger to the tip of the tongue of the shoe, without obstruction. This is possible because the Derby is characterized by the so-called "open lacing". The Derby is a shoe less formal, albeit classic, that it is well suited to jeans to a dress of day.
Oxford model is in absolute the shoe more formal, perfect for the clothing business and social events or ceremonies. In this case, ideally by removing the laces, you can't slide your finger to the tip of the tongue of the shoe, because the base of the laces is stitched right on top of the shoe.