Rebuild 904 or swap for 727?

Everybody talks about "quality parts" as if there are junk parts available. I would like to be made aware of any "un-quality" parts available..In forty plus years, I have NEVER found any sub par transmission parts. The strange thing to me is that; knowing the weakness of the direct clutch pack, I hardly ever hear anyone refer to using .061 performance fibers; allowing for an extra plate. If you aren't aware of this trick, then you don't know the first thing about a "quality rebuild using quality parts".