Depends if you want to do Stick/arc (SMAW) MIG (GMAW) or TIG (GTAW) and how much you want to pay. For stick welding, the inverter units are pretty good (at least those I have used) and they are easier to move. There are some multi process units out there made by companies like ESAB, but I think they will likely be quite expensive. In terms of the ease of use, MIG is almost like hot glueing stuff (I know there is more to it than that, but it is an easy one to learn.) Stick can take a while to get used to striking arcs, then holding the rod at the correct distance from the work piece, all while moving along and in as the rod gets used up. With practice, you do get used to all of that. In terms of accessibility, I think stick is the easiest, as you just need the rods, welder and work piece, the others require gas. At work I use a little Jasic 180A inverter, but with the general welding I do, I would be unlikely to go over 120A, it's just nice having the extra little bit of headroom, which can also improve duty cycles. ETA: At Wellington Welding, you can get a Jasic 140A inverter stick welder, which runs on 230V, for just shy of £200