Jumbo-Visma have won all three Grand Tours this year and completed the whole podium of the Vuelta a Espana. These results alone would be a good argument, but the Dutch team have been very strong all-year round and there is the internal belief that they were the superior team in 2023.
The UCI rankings point otherwise as UAE Team Emirates are set to be the victors, however this is due to the specific team focus on the ranking - most likely as a sponsor request. The two teams were head and shoulders above the rest this field, however
Jumbo-Visma was present in all terrains and even outside of racing they were constantly in the headlines - most recently due to the possible merger with Soudal - Quick-Step.