Jason, what are you referring to here? I'm slightly confused and please take no offense as I'm just trying to figure out what you are talking about.
The "assemble yourself" cages like AP, Pro-Line and some of the others recommend you seal the seems after you put the cage together.
Cages like Boaphile are assembled and shipped as a whole unit. They are welded, but you can't really compare them to a cage that is shipped "flat" and then assembled at your home.
Both have their pros and cons.
I just am not sure what you are talking about is all, so maybe I'm missing your point.
I know Aaron is a big advocate of AP and he's a pretty meticulous keeper. I'd consider AP high quality as far as caging goes based on his experiences.