I think the RedLine 20W50 engine oil, the regular one as opposed to the racing oil, is very good and in the class of the BelRay. Both are diester based synthetics.
It's just that the difference in price from the BelRay to the RedLine, considering the amount of oil I use, is not significant enough to change from something that has worked exceedingly well over many years.
As far as the gearbox and primary oil, generally with a new bike I try to establish some sort of baseline at first, in particular if I get the feel there might be some sort of issue. The conclusion over time is that on most bikes I would have no reservation whatsoever of running the gearbox oil for 10 and even 20K miles. On the old bike this was also the case with the primary. On this bike I will likely change the primary once or twice more at the normal intervals, if not shortened ones, because I have a reason to look in there now and then. Might turn out to be nothing but a characteristic of this particular bike.
In other words I don't maintain my bikes at specific intervals, while I probably overmaintain them, when I get the feel something should be looked at or observe something not quite usual regardless of mileage, I look at it. Works for me.
The only thing is that I would replace all this stuff once a year regardless of mileage if for some reason the bike wasn't ridden enough.