Your auto manufacturer does not make most of the parts you are asking about. They make the vehicle. They are an assembler. As such, jeep isn't making your water pump. Stellantis, Fiat, Chrysler, Dodge, or whoever owns them now pays the lowest bidder to make them and cast a brand in it. Bosch contracted with Ford to make my ignition coils. So I can pay 70 a piece for Motorcraft, or get the Bosch for 30. Ironically, I rolled the dice on my ignition coils and bought EIGHT of them for less than the cost of 3 of the above brands and they have outlasted both the OEM and quality aftermarket versions. So, YMMV.
I still prefer OEM or the parent manufacturer if I can determine who that is, and the difficulty of the repair has a huge impact on my decision.
For Thermostats, I liked Robertshaw or OEM. But, I've never had problems with Stant or any other brands either.
For water pumps, I prefer OEM, but I've installed Oreilly lifetime OEM rebuilds and they have lasted hundreds of thousands of miles....literally.
