The EU tyre label has been put in place to simplify the tyre decision, as it makes it easier to compare tyres. The tyre label gives you 3 performance indicators so that you can compare the tyres and how they perform on these.
You have the rolling resistance, which indicates the energy that is consumed by the transformation during the road contact of a tyre. The rolling resistance can be correlated to how much extra fuel the resistance will cause. A low rolling resistance will consume less fuel than a high rolling resistance.
There is no reason whatsoever to select a tyre that has a high rolling resistance. It will consume more fuel and generate also more carbon dioxide emissions.
Then you have wet grip, which shows the braking distance on a wet surface. The quicker you can stop, the more likely you are to avoid accidents. Wet grip is an important safety aspect of a summer tyre. So you should always try to select a tyre that has good wet grip rating. This is of course more indicated for summer tyres and can’t be directly translated to any winter properties.
Finally you have tyre noise, which is the sound level that the tyre reaches when it is rolling. This can impact your driving comfort and more so if you have a hybrid car or an electric car, as they tend to be quieter. Here again there is no reason to select a noisy tyre.
So by selecting a tyre that has low rolling resistance, good wet grip and low tyre noise, you have generally selected a good tyre.