Bhagavad Gita · 12.1

अर्जुन उवाचएवं सततयुक्ता ये भक्तास्त्वां पर्युपासते।ये चाप्यक्षरमव्यक्तं तेषां के योगवित्तमाः॥

arjuna uvācha evaṁ satata-yuktā ye bhaktās tvāṁ paryupāsate ye chāpy akṣharam avyaktaṁ teṣhāṁ ke yoga-vittamāḥ

Arjuna asked: Between those devotees who are always steadfast in worshiping you in your personal form, and those who worship the imperishable, unmanifest Brahman — who are considered more perfect in yoga?

— Bhagavad Gita 12.1

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)