Newbie welder question.

I was told by a long time pro welder to use a .035 tip with 030... the tip will last longer as it does not get stuck in there. OK my language is not welder professional. I started doing that couple years ago. Works for me. I use way few tips with the tip one size larger. Just try it.
I have a little 110 Hobart that is 15-18 yrs old. I can weld some decent steel with .035 but the thinckiness is, I forget, maybe 3/8 maybe ??? I had an old stick welder I used pretty much for heavier stuff.

Today I am welding outside some 60 years old sheetmetal with .030. It ain't that easy, but I got it done. Would be harder to weld it with .023 and gas in the outdoors!!!!