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Well here is my opinion, I welded for 40+ years I think that the down hand weld is not as strong as vert up but a lot of shops that do roolbar work use it. thay are putting a 20" gas line in down the street from me, welded down hand, E7010 just like we welded it back in the 60  . And to me mig welding is junk weld I have seen some of them atculy peel off  By the way the cage in my car is miged vert up   
Yes in certain applications vert down is ok. In a 6G application like you are talking about, there is a rod designed specifically for vert down. It's a pipeliner rod E7010-P1 this is made specifically for vert down on pipe.
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