I find myself doing both... pulling mostly.... I've never been officially "taught" how to weld, just been using a MIG off and on for about 15 years and I think Greg said it best... you have to play all the options of what you are welding, the physical access to the weld, the material you are welding and do what is most comfortable. I find that I can control the heat in the metal better when I pull, get a better looking weld, and better penetration.
+1 on the practice!
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