Personally I haven't bought anything but Mobile 1 for at least 15 years...
I've always used Mobil1 oil and filters in everything. It might not be the best out there, but it's definitely not the worst. It's readily available. And the price isn't horrible, especially since they run sales on it every couple of months at the auto parts stores. Yes oil/filter quality is important, but I think even more so is actually performing the maintenance at regular intervals.
If I may add this youtube explanation of dino vs synthetic oil. It's quite informative, and will open eyes while perhaps dispelling some myths.
Is Synthetic Motor Oil Better For Your Car? - YouTube
A very good oil for a non-emission engine is a API SD oil. As in the video, they are up to a API SN oil which has way less of the good additives like zinc and copper. The oils are changing for the the auto industries pollution standards and the associated equipment.
https://www.hemmings.com/blog/2012/10/18/tech-101-zinc-in-oil-and-its-effects-on-older-engines/
http://www.pqiamerica.com/apiserviceclass.htm
But there are very good alternatives to zinc going into many modern oils. Molydenum is one. Boron is another. And in combination, these two offer some very good anti-friction qualities. I have been a fan of Moly for many years. It is a proven friction reducer. Zinc and Phosphorus (ZDDP) has done a pretty good job. But it is no longer the cat's meow when it comes to superior friction reduction.
I use Mobile 1 in my Corvettes. It was required when they were under warranty. The oil cap even says Mobile 1 on it.
If I may add this youtube explanation of dino vs synthetic oil. It's quite informative, and will open eyes while perhaps dispelling some myths.
Is Synthetic Motor Oil Better For Your Car? - YouTube