Of all types of worship, worship of Lord Vishnu is best.

As stated in the Padma Purana:

aradhananam sarvesam visnor aradhanam param
tasmat parataram devi tadiyanam samarcanam

“Of all types of worship, worship of Lord Visnu is best, and better than the worship of Lord Visnu is the worship of His devotee, the Vaisnava.” There are many demigods worshiped by people who are attached to material desires (kamais tais tair hrta jnanah prapadyante’nya-devatah). Because people are embarrassed by so many material desires, they worship Lord Siva, Lord Brahma, the goddess Kali, Durga, Ganesa and Surya to achieve different results. However, one can achieve all these results simultaneously just by worshiping Lord Visnu. As stated elsewhere in the Bhagavatam (4.31.14):

yatha taror mula-nisecanena trpyanti tat-skandha-bhujopasakhah
pranopaharac ca yathendriyanam tathaiva sarvarhanam acyutejya

“Just by pouring water on the root of a tree, one nourishes its trunk and all of its branches, fruits and flowers, and just by supplying food to the stomach, one satisfies all the limbs of the body. Similarly, by worshiping Lord Visnu one can satisfy everyone.” Krsna consciousness is not a sectarian religious movement. Rather, it is meant for all-embracing welfare activities for the world. One can enter this movement without discrimination in terms of caste, creed, religion or nationality. If one is trained to worship the Supreme Personality of Godhead, Krsna, who is the origin of visnu-tattva, one can become fully satisfied and perfect in all respects.

Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Eighth Canto, Chapter 5 – Text 49