A lot of good comments Rich. TIG is the most versatle for different metals but is the hardest to learn. MIG is probably the easiest and my choice for 90% of my welding jobs. It would help us to guide you further if you could be more specific about what you think you would be welding especially in terms of thickness and what types of metal. For example, stick welding will weld rusty steel but MIG and TIG need clean steel.