TIG will do anything MIG will do, but in general it’s much slower and requires more precise technique. I’ve had both. I now have only a MIG but wish I still had my TIG because there are some things like sheet metal patch panels that I think I could weld cleaner with a TIG. Having said that, for the average Joe who periodically just needs to cobble together a few metal parts, a MIG unit will let you have success earlier. I think old ugly has it correct.
I am NOT a welder by any stretch. A few critical welds I’ve needed, like replacement shock balls in axle housings, I’ve taken to my local certified shop around the corner.