Without talking about brands, I did some light reading on oils.
The xW-y oil ratings, for example 10w-30, came about after the introduction of polymers to oil. It is said polymers is the best thing to happen to oil since sliced bread, but it also comes at a cost. The cost being added stuff in the oil that can burn.
The higher that dash number, i.e. 10w-30 v. 10w-40 means there is more added stuff in the 10w-40 oil.
The additives in the oil act to thicken the oil as it heats up. At ambient temperature, the 10w number in this example means it is the same weight as 10 weight oil at cold temperatures. The additives, which are spiral, cork-screw shaped polymers, are tightly wound when cold. As the oil heats up, the polymer spirals expand causing the oil to get thicker. The oil thereby never is allowed to get thinner than Y grade oil would ever get when hot. So, 10 weight when cold, 40 weight when hot, for a 10W-40 oil.
However, due to the required additives required for larger ranged oil ratings, 10w-30 vs. 10w-40, the 10w-40 oil requires more polymers and therefore is more susceptible to burning at higher temps due to all the extra stuff.
In short. Use the least extra stuff in your oil as you can get by with under your conditions.