I think the MIG wire welders are easier. I actually know how to Oxy-Acetylene weld, which is supposed to be harder. Dates back to my early days in the mid 80s as a gunsmith.
(Wonder how many people can state gunsmith to OB/GYN/MFM as a career path).
Plan on buying a MIG package at good old Harbor Freight when I return. they have one that comes with the spool gun. I have many, many aluminum scraps to practice with.