Different welders are very good for different things and they don't really cross over in application that well - by that I mean a good operator can weld with two batteries, some No8 wire and a supply of farts but a crap welder could cock up welds from a robotic welder that requires no human interaction...
Just starting out, my advice is hit Youtube and then go for a multi process machine that does Arc/MMA/stick welding as well as MIG/MAG/wire feed welding. Get one that is the max at what your power supply can operate as that gives you more welding time against machine cooling off time, and also try to get one that has 'stepless' adjustment of the Mig process (i.e. you don't have say 4 or 6 voltage settings but can adjust a knob to suit). These are a little easier to adjust once you have the knack.
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