Tonie, if you want a consensus view on the best oil to use you've come to the wrong place! There are as many opinions as there are oils available.
The main problem is the oil companies are a secretive lot... even if you can find something claiming to be a technical specification for a particular product it turns out to be vague advertising puff.
We do know that bike engines are a tougher challenge for oil than car engines, and also (mostly) have the constraint of a wet clutch. We also know the wear reducers of last resort, those containing zinc and phosphorous, are not good for catalytic converters so the concentrations are restricted in car oils. Now, since bikes in the UK don't need cats, in theory, motorcycle oils could contain higher levels of these additives. Whether they actually do is another matter, the rest of the EU says bikes do need cats... so do oil companies make different oils for us bikers in the UK? I don't know the answer to that. I just guess they might and can at least be sure that if it says "Motorcycle" on the can it's not going to contain additives that make the clutch slip.
It's not like the difference in price is that great. If you buy the cheapest car oil you can find, you might save £12 on the oil change compared to something that says motorcycle on the container, which equates to about a fifth of a penny per mile... that compares with around 11p per mile you're spending on fuel (assuming your bike returns about 52mpg, which is what mine does).
For peace of mind, that's not a saving I regard as worth making.
Hope you're having a happy birthday, btw and I hope someone bought you four litres of expensive bike oil.