You will likely see the licensing cost about the same. What varies is the license approval based on food safety and sanitation plan, that can get complicated depending on the type of food categories. Regardless of the option you choose, you will need to go through the license approval process. 

I would also recommend to consider your main customer and that usually help to segregate what you need. Having a permanent location, restrict customers that you could reach while the food truck give you flexibility to move around.