I decided to go with oxy acetylene because I don't have 220v to my house, I plan to do a lot of sheet metal work, you can weld just about anything with it, and it cuts. Oxy acetylene and TIG are the best for sheet metal welding bercause it is very easy to control the temperature, but the process is very difficult to master and laying a bead is a very time consuming process. The kit I bought can weld between 1/64th of an inch steel up to 1 inch. It cuts steel up to 6 inches thick. Now that is flexibility. With MIG, you hit the button and you're done, but don't expect to do anything much thicker or than sheet metal with a cheap welder. MIG is probably the best welder for the hobbyist.