Personally, Illadelph Halflife is my favorite album by The Roots, and that's saying a lot because The Roots have a very strong discography.
This album mixes a lot of different styles of music into one. The first half of the album is a bit more guitar-oriented, while the other half is more jazz influenced, and there are DJ shorts in between. Black Thought doesn't disappoint with his lyrics as usual. Personally, I'm feelin the jazz tracks more. 'No Great Pretender', 'The Hypnotic', 'Ital', and 'One Shine' are my favorite tracks and in my opinion worth the purchase.