My goal wasn't so much as brand loyalty, but to find two oils that are easily available (at local stores) that together would sufficiently fill all of my motor oil needs.
Those two oils just happened to be in the SOPUS family. So, it has led to some loyalty.
Pennzoil Gold 5w-30 (trucks, van, motorhome)
Rotella T 10w-30 (everything else - L&G equipment, generators, tiller)