That depends on two factors. 1) the thickness of the material you're welding, and 2) whether you're welding flat and horizontal only, or welding all positions.
For out-of position welding on medium to thick plate, thicker than about 4mm, gas-shielded flux core wires such as E71T-1 are the winner hands down, as far as productivity goes.
For flat or horizontal welds on materials >3mm, spray transfer using solid wires such as ER70S-3, and argon + 18% shield gas, is vastly more productive than flux core wires.
This is because, if the settings are properly adjusted, spray transfer produces almost no spatter and requires very little clean-up time. Furthermore spray transfer enables fast travel speed and fast weld deposition rates.
For welds on materials thinner than 4mm, it's wise to select solid wire MIG w/ short-circuit transfer mode.
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