only thing I can see is A: where you live. Lots of salt in the area, may look at stainless for longevity. B: How long you gonna keep your truck? Forever? again, stainless. Gonna trade in a couple years? go cheaper with aluminized.
I went with the aluminized because Im in the south ( not alot of salt used on BOTH winter days we had last year HAHAAHHA). And I'm constantly in,around,under my truck so i can just respray it at leisure.
Just a few things I've learned from the friends I have on here. It's all in what you'r prioritys are. IMHO.
And get gauges FIRST!...THEN start modding. Ask around, I'm not the only member who will tell you that lil bit of info.