Many would say (I wouldn't) that Millers is a lesser brand. I've always used Millers XFE-PD in my diesels, I think its great stuff but I don't think any of millers oils are necessarily better than the likes of
Comma, Valvoline, Fuchs etc just because they have a Millers
sticker on the bottle. There is very little difference if any, in their composition. Fuchs and Comma especially have an outstanding reputation, better than Millers outside of VAG circles. We use Fuchs oil in the guise of NATO designation OMD90 in our Warrior AFV engines which are upwards of £100k each, its not used because its cr*p oil.