Indeed there are many quality options, but it is interesting what oil most of the heavy duty engine OEMs pick for R&D work (not the beancounter-driven "factory fill" oil for the truck assembly line):
CAT: Mobil Delvac technology
Detroit Diesel: Mobil Delvac technology
Mercedes Benz: Mobil Delvac technology
Volvo: Mobil Delvac technology
Mack: Mobil Delvac technology
In truck stops, Mobil Delvac 1300 is the #1 oil as well (overtaking Rotella - now #2 - a couple years ago).