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I am stuck between a 120 and a 240? Answered

I have seen a lot of people say that they bought a 120 and wish they went with a 240, but I am having trouble seeing a need for it, and maybe it is because I am new to all of this. I want to build what I think are simple things: a coffee table, a wood stove, a welding cart, and some sheet metal projects. I was looking at the eastwood line (135 or 175) and the Horbot line. I am just not sure how to select the size metal I need for each project.