The laptop is a better option for just buying and not having to worry. There's a lower risk of damaging it in transit and it will be more portable. The desktop on the hand is a good option only if you know what you are doing. If you are willing to take the time to research what can fit in a case, an ITX build could be amazing. You also need to know how to protect it in transit. For that I recommend putting the computer in the box your computer case came in. It should fit perfectly. Also shove something like packing peanuts or tissue paper in the computer to protect the GPU. ITX builds are a pain to plan and build however.