Flux core mig sucks! Never seen anyone succeed with that. Better off with stick.
But for versatility and ease of use, a gas mig welder wins. The more money you can put into getting a decent welder and gas setup, the easier the learning will be. And industrial gas is way cheaper than the tiny hobby gas bottles.
Personally I'd go used welder to save some £$. And get an auto darkening welding helmet. Even the cheap ones are ok.
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