Philips 66 makes good products. So does Chevron. Valvoline is like AMSOIL in that they try to offer a product for every application, however, they're quite the opposite when it comes to quality.
Shell was never considered anything special in Europe when it comes to motor oils, and still isn't. Their product lines are even more confusing over there. In Europe, most people that don't want to know too much about motor oil just use Castrol, LiquiMoly, Esso, Aral, etc. Castrol is still very popular, and for good reason: it's a decent product. For Mobil 1 products you pay a premium that many are not willing to do. Motor oil is expensive in Europe, so it has to be good to command a premium. Also, you will not find "High Mileage" motor oils in Europe. That's because they don't kill their engines by running thin oils in them for the first few years, but rather they run a manufacturer-approved oil. Because vehicle inspections are much more stringent in Europe, a poorly maintained vehicle can take it off the public roads much faster than a dead engine.
My point is that Shell isn't "all that." They're great in the commercial space, but still have ways to go in the consumer market. Not even two years ago I was in a bind and did a dealer oil change in my 2018 Hyundai. They use some 5W-30 Shell-supplied "synthetic-blend." The same crap is supplied to all the dealerships in the area. In less than 5000 miles I saw light-brown varnish deposits all the way to the oil filler cap. So they still sell a lot of crap. Probably all manufacturers do, but I have yet to find a reason to buy their products. I tried PUP 5W-30 and it was basically 5W-20. I have to admin though that the new Quaker State Euro 5W-40 has me intrigued as it's got a bunch of approvals and it's API SP.