Do you push or pull your weld puddles?

I have found that no matter what type of welding I do (oxyacetaline, mig, tig, or stick) whether pushing or pulling, if you can see the weld it will look like crap, but if the weld is under the car somewhere you cant see it- it looks like a pro did it. I am self taught and do push and pull beads and I cant really tell the difference, both will do the job