I would choose Lincolns wire over anything. I have seen many problems with hobart wire before. the great thing about Lincoln is there a vary consistent company...in all aspects. but i do love my miller. and at far as the ER70S-6...that has nothing to do with brand. its just the style and make of wire. and for size... the most noticeable difference i believe between those specific wire dimensions will probably be the speed, the 035 will just deposit more making it go faster (but will you will have to crank up the heat). I like the 030 cuz you can just cruz a long and burn it in good and hot, seems to be the best fits-all-application sizes of wire. as the size of wire increases you have to compensate with more wire speed (amperage) and voltage. so your ability to weld really thin material becomes pretty damn hard. in other words id get 030, unless your only welding 3/8" + material. but for the most part its just user preference. good luck
