Yes, Ashtavakra Gita is a vedantic text that focuses on describing the absolute truth.

Bhagavad Gita is more versatile since it covers the many aspects of action (karma), devotion (bhakti) and knowledge (jnana). The highest truth about the Self is described in a few verses that are sprinkled throughout the text and many other aspects such as creation of universe, modes of mind, action, renunciation, imbibing godly qualities, shunning demonic qualities etc. are all found in it. Shankaracharya's commentary on it makes it very special too.