A laptop is generally better for UX design because it provides you will all of the same features as a desktop, plus the added benefit of portability. However, if you always work in one place or work for one company, a desktop computer will suit your needs perfectly. If you are always on the move or if you are a freelance UX designer, then a laptop will be better for you. Sound quality isn’t generally as optimal on a laptop, but it’s a fair trade if you don’t have a stationary place to work.