For thin sheet aka car body panels I would go with the gasless mig (the wire produces its own gas via the flux it is treated with, so you have to get gasless mig wire which is more expensive...).
I have used both and made many things with stick - even dung forks using old broken lorry halfshafts and 8" angle with 6mm rods to get the runs down faster. Would ...
Use the proper disconnect tool. You do not want to damage the line and have to replace it, or have it leak.
Depending on where you buy it, sometimes the tools can be expensive especially in smaller parts stores. Amazon sells several fuel line disconnect tool kits for under $10.