Mig is great for tacking "art" together and provides a fast spot weld that cools relativily quick. Plus you can hold with one hand and weld while supporting a part with the other.
Both tools have their place and I also use my oxy/acet kit to heat and bend when needed but you can't beat the advantages of the mig.
What thicknesses do you need to weld?

I was on vacation and travelling for work. only been home 2 weeks the last 6. I have one more trip this year and I'm done!