Sure, it's a hobby for many. But does it really make any difference what oil we use? Few are going to extract every mile possible out of their engines.
Hobby, decades ago there was a difference among oils, API standards were way lower, some oils clearly were inferior when it came sludge, deposits, flow and viscosity. Heck, even consumer reports at one time tested oils, Castrol at the time was the leader in tests from what I remember. They no longer test for the same reasons below. At the time the 4 ball wear test actually showed significant differences among oils, no longer.
First oils are so superior and the API requirements so advanced they make oil failures rare to impossible if you're using the recommended oil in a properly engineered vehicle. In addition engine manufacturers sometimes further those requirements and ratings with their own such as GM Dexos.
Next, much like gasoline delivered to your gas station (but not exactly maybe) The oils themselves have additive packages made by other companies that the oil brand you are using contracts with. Maybe there is a handful of companies that actually make the additive packages in the motor oil that you use. It's so standardized, computer controlled to an exacting science.
Decades ago, I used exclusively Castrol multi viscosity oil at a time where multi viscosity oils were coming to market. Most all the time in 20/50 weights, maybe a 10/40 as years moved on.
Now, I use whatever is on sale, cheapest stuff on the Walmart rack or many times Chevron bought on the Internet as long as it has the recommended API and/or (in my case) Dexos classification.
For my wife's Mazda Skyactive engine I use whatever current rated API oil.
I never use less than 5w30 oil in the Mazda and 5w30 is called for in the GM.
I could care less if it is synthetic or conventional as long as the proper API/Dexos on the label.
I ALWAYS change oil and filter in most cases before the required interval and never after the required interval.
Fingers crossed, in almost 5 decades I never had an engine failure and never owned a vehicle that burned oil.
Im not cheap, I just dont accept marketing BS without proof and standardized testing and as mentioned I always change at the required interval with a nothing special filter and normally much sooner than required.