MIG welders are typically used for larger welds and are much more powerful than tig welders. A mig welder is good for auto bodywork .they also have a longer reach, making them better suited for welding in high-up areas. Tig welders are great for smaller welds and are much less expensive than MIG welders. They are also faster and easier to use, making them a good choice for welding on multiple pieces at once.