Srila Prabhupada

So in the Śiva Purāṇa, there was a question by Pārvatī to Lord Śiva. Lord Śiva and Pārvatī, husband and wife. Pārvatī means the material nature. Sṛṣṭi-sthiti-pralaya-sādhana-śaktir ekā chāyeva yasya bhuvanāni bibharti durgā (Bs. 5.44). Durgā-devī.
Durgā-devī is in charge of this material world. It is called durga, durga, just like fort. And the superintendent of this fort is Durgā. You cannot go out of this fort, you are imprisoned. Such Durgā-devī, who is so powerful energy—she can create, annihilate, maintain, sṛṣṭi-sthiti-pralaya-sādhana—she is always sitting by the side of her husband, Lord Śiva, and questioning about spiritual enquiries. Just see. Such powerful deity is also ignorant about spiritual life. So the husband, Lord Śiva, is Vaiṣṇava, and she's always asking, and sitting down underneath a bael tree. She can create so many universes, but for her, no building; only underneath a tree.
So the question was, "Which worship is best?" So Lord Śiva replied, ārādhanānāṁ sarveṣāṁ viṣṇor ārādhanaṁ param (Padma Purāṇa): "My dear Pārvatī, of all methods of worship, Viṣṇu worship is the topmost." There are many demigods' worship, even Lord Śiva's worship, but Lord Śiva says: "Viṣṇu worship is the best." Then he says again, tasmāt parataraṁ devi: "My dear Devi, better than that Viṣṇu worship is tadīyānāṁ aradhanam." Tadīya.
Tadīya means those who are in relationship with Viṣṇu, tadīya. Just like His devotee, tadīya. Tulasī-vṛkṣa. Tulasī is tadīya. Or temple tadīya, preaching tadīya.
(720821 - Lecture SB 01.02.18 - Los Angeles)