Interesting comparisons between the two build locations. In CR terms, I have owned three. Two Mexico built and one German built. I feel my German car is more solid....
With regards to the Puebla builds, my Mk7 Golf feels more solid then my Mk6 JSW.
All just my personal observations with driving all three a lot.
That could fall within the realm of natural variation. For me it's the opposite, my German Golf feels looser and has more rattles than my wife's Mexican wagon although the German has tighter handling. But that may be more chassis design.
However I'd expect the Mk 7 to feel tighter than the Mk 6, it's supposed to have a stiffer build. And in fact your JSW is a face-lifted Mk 5, not a Mk 6.
I'll soon know about Mk 7 vs 6 stiffness, I just ordered a 2016 Golf to replace my Mk 6
My German B5 Passat was probably the most solid build of any of my VWs to date though. At least initially. Now, approaching 11 years of age and 280k km, it's rather loosened up a bit.