Do you push or pull your weld puddles?

I always felt it depended on the thickness of the metal and position, but I am self taught old school, but what I have done for 55 years has worked so far. I use this tip seems to help with mig, use 1 size larger tip than the wire. ie .030 wire use a .035 tip. Tip gets screwed less often seems.
My teacher 55 years ago was also self taught also. His method to test the weld, knock the chit out of it with a big hammer and see if it falls off!?????????????????////