In general observations;
OEM is mostly best, but better even still when there was an updated OEM replacement version of such an OEM part so shown to have a premature failure rate, and thusly OEM replaced. For example(s); The 4.7 liter OEM intake manifold gasket for the '99 Jeep Grand Cherokee WJ was replaced for a better OEM one. Same for some years of the XJ's 4.0 liter head, (Tupy replacement recommended, etc.).
Parts made in china I avoid due to central planning, and red army managed slave labor manufacturing.., and the fact that quality control is substandard. After spending much time, and energy, I swear at those bastards when I must replace a new commie part for another, i.e., hit and miss mechanics.
Unfortunately for me; the nearest junk yard in which to scavenge OEM parts is a 450 mile round trip.
Fortunately for me, some parts stores can still offer quality U.S.A. made parts, although those sources are drying up. EBAY is also useful, and of course google searching is helpful.
I would like to see a list of the best made parts, but I am in no position to provide said.
I trust the other members here who from time to time recommend specifically identified parts when asked. Examples; Bosch fuel pumps over most of the rest. Japanese starters seem ok. My bias leans towards OEM parts, then German, or Japanese made parts, rather than those made in china.
Some here have tested new parts from china that fail OEM specs out of the box, (worse still when installed as such), thus your assumption(s) are correct. :us: