If you sit at a desk then you dont need a laptop. They are expensive to fix as opposed to a deskto pc.
If you travel round doing presentations and the like then get one.
Its a tool for a job to me. Laptops are more fashionable thugh but when your grahics card blows dont be suprised to get stung for a good few hundred pounds as opposed to 50 for a PCIExpress one for a desktop