Answer:
Uddhava Gita is more difficult to understand than Bhagavad-Gita.
Explanation:
Bhagavad-Gita is Karma Pradhana dedicated to duty and responsibility, while Uddhava-Gita is Bhakti Pradhana dedicated to Bhagavatha Dharma. Bhagavad-Gita is simple and some what with less secrets when compared to Uddhava Gita. But both contained the essence of Vedas.