We are doing project welding some 3/8 plate to 3/8 and 1/2 steel plates together, tab and slot, all fillet joints. WE jobbed part of it out and the guy did it all with 6013 stick rod. I was always taught to use dual shield flux core MIG for this sort of thing. Thoughts?

I was asked this at work and didn't really have a good answer that I felt was comprehensive. Can you guys and girls shed some metallurgical light on this subject for me? The internet was useless!