YeeHaa! almost an oil thread
Bob, Brick has access to the company literature, but in an earlier life I worked for an oil distributor that also had oils blended under their own "brand" so my thoughts are worth what you paid for them
Any oil that meets OEM specs and is changed at proper intervals will give you fine service, Period, END of DISCUSSION!
The rest is personal preference and in consideration of extreme service conditions. It is simple science that true full ester synthetics will outperform "blended" dino/synthetics and those will outperform dino oil. This has to do with shear, temperature stability and flow, etc., etc. An example(s) where an application MAY require thinking about the use of synthetic blend or full synthetic for me would be doing a bunch of stop and go city type riding with high ambient temps, track day type engine loads, etc. BMW, Guzzi, HD, etc., with different oil for engine, transmission and final drive help minimize shear and combustion and/or clutch contaminates from making higher demands on the oil to maintain it's "quality" as a lubricant, your new Boxer engine gains help with heat from the water, but now share oil with the wet clutch design. The degradation is quicker in dino oil and that is why service intervals are generally shorter, it is said that a true full ester oil really doesn't need a weight (10-40, etc.) as it has such a wide temperature range it works properly and filter changes are more important than the fluid and an oil analysis will support that. I don't have that data, but the science is sound.
For the record I have used T-6, Amsoil, Mobile1, BMW(Golden Spectro in USofA) Motel and Motorex (10-60 in the Guzzi is liquid gold $) and an occasional "whatever" in the proper weight on a trip when a little low and have never had any oil related issues dry nor wet clutch in British, Italian, German and Asian OEMs.
Cheers