I know the difference between straight gauge, double, and triple butted, and kinda about heat treated. But I really have no clue about 4130 tubing. Sure it's better than gas pipe. But many low end bicycles use 4130. And some mid range bicycles use 4130 also at twice the price. And there's Renolds 853 and such. SL of a thinner gauge, more difficult to weld properly but builds a lighter thus better frame.
So please educate me. Master!!