Do you have pets? If you do are they white or light in color? If they are then a black sectional sofa is not a very good idea. White pet will stick to that black fabric like a magnet.
Will the new couch fit? It is always a great idea to measure so you know exactly how much space you have.
Leather is always very popular especially in black. It is comfortable, durable and elegant. Microfiber is also becoming extremely popular these days. People seem to love it's great resistance to spills, stains and messes. It is a great choice for families with children.