aluminum is one giant pain if you ask me. It takes a lot of amps, and cleanliness borders on fanatical - all that for tig -
For mig, you would need a spool gun, which makes life easy, but is costly for the home user unless you have a lot to do, plus only the pro-sumer boxes will accept them. Cleanliness is still important, but not as much so.
I would mig stainless all day if I could. virtually no difference in technique and such from mild steel. PS - the heat bluing comes off chemically, no need to sand it.
a near-death experience is just god following "catch and release" regulations...
john (johnny) henley