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A good stick welder will deal with rust, paint, and other stuff on the metal better and still deliver a good sound weld. MIG welders will weld faster but the metal has to be clean (i.e. wire wheel.) You can also get flux cored wire for a MIG that is the same in concept to what a stick welder has. MIG welders using wire and gas also can't be used in windy areas as the shielding gas will be blown away leaving a defective weld. Make sure to have your supplier set you up with the right electrodes or wire for what you're welding, vee out the part to be welded with a grinder so you get good deep penetration, and don't weld too fast. It's very common to see people weld too quickly, leaving a high rounded bead with little penetration. The book "Welder's Handbook" by Richard Finch (ISBN 1-55788-264-9) is a good one to get you started. In reality, you can do pretty much anything you want with a stick, MIG, or gas welder, a lot of it boils down to convenience, cost, and user preference.
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