Fluxcore blows plain and simple and so do any 110 volt machines, they cannot deliver amperage needed for serious welding.
I run the same wire for everything, .030 INE 70-6. I own and operate a small welding and fab shop wit 2 employees and I've tried every brand of wire made even the Chinese stuff and not one compares to INE for wet out or limited spatter.
of course that requires a 220-1 MIG and a bottle of 75-25 shielding as as well. I even use 030 INE for spray arc transfer (Globular Transfer) with a Hobart 210 MIG running flat out. Just repaired a parallel linkage for a Case extenda-hoe that each side was 3/4" thick. I multi passed it after grinding a root bevel on each side to the root, tacked it together, clamped it on the welding table and used spray arc transfer to fill in the bevel, 4 passes on each side with the 030. I don't run any other diameter and I will never use flux core, far as I'm concerned it's fuc*s core. Matter of fact I have a couple unopened spools sitting around collecting dust if anyone wants them. You pay the postage and I'll send them to you, no charge. Couple spools of Hobart and some Forney.
I mostly do TIG here in exotic metals like stainless and alloyed aluminum and yes I can butt weld (TIG) aluminum pop cans together. I like TIG because it the material conducts electricity, it can be welded. That includes copper as well. All you need is the proper filler rod. Of course TIG requires skill whereas MIG don't require much skill at all. In fact I refer to MIG welding as 'Glue Gun' welding. I cut my teeth of OA torch welding. I've stuck countless things together with the now ancient metal coat hangers and some of them are still around.
Nice thing about OA welding is it's a good primer for TIG welding. same discipline allpies. Both are 2 handed operations except with TIG you have to keep the filler rod in the inert gas envelope and instead of a flame, you have a white hot tungsten rod with an arc, heating the filler rod and making the weld puddle. Take skill to produce a strong weld with either. No skill involved with a glue gun though a glue gun is quick, But they are limited in materials welded scope. I have one of the new ESAB pulsed MIGs as well and it produces a TIG looking weld (stack of dimes) but again, limited scope.