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MIG is certainly easier and takes less practice than tig for sheet, MIG is a fast freeze process if you will; and if setup right will minimize distortion.
The newer TIG's with pulse can work well, some guys still do it with oxy acetylene so it can be done a lot of different ways. One thing is to practice your filler rod feed, while your watching TV etc you can practice for a smooth steady feed. I can do sheetmetal with TIG but not well- some naturally have a more steady hand than others. Be sure to weld with a sharp freshly ground tungsten and keep your torch really close (usually about the width of the tungsten.)
I'm really experienced with MIG welding heavy structural stuff and do ok with sheet metal. I use .023 or .030 easy grind wire, I run a bit hotter than most and do a lot of short bursts. Only weld 1/8-1/4 at a time depending on the application. Miller Welds has a forum that can be really helpful for specific welding projects. Good luck!
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