I Googled "Forney EZ Weld" and it appears that it is a flux core only machine with no capacity for gas. So that decision has been made for you.
Again, I'm not even a good weldor much less an expert, but it seems that strong welds are a function of penetration, and multiple passes of low-penetration welds typical of a 110V welder running gas and solid wire may not achieve the results of flux core welds from the same machine, on thicker steel. But it is important to practice a lot to eliminate flux inclusions, and personally I don't (yet) weld anything that could endanger me or others.
BTW, I use Hobart E71T-11 wire and have had good luck with it.
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