Quoted from fnosm:Great question.
Looking through the manuals The Simpsons Pinball Party is listed as ~260lbs. Stranger Things (Premium) is listed as ~210.
An ugly AFM wannabe vs one of the few packed games Stern ever produced, is really not a fair competition. While I would take all these weights with a grain of salt, AP lists Hot Wheels as 275lb unboxed and a AFM are around 250lb, those would be more of a fair comparison.
I think that anyone who honestly believes that Stern currently produces a quality product ether has never owned anything but 2012 and newer Sterns or is completely delusional. My 2004 Stern RBION (while I would not hold it up as the pinnacle of quality) feels like a Bally/Williams game comparatively to modern Stern machines.