Giovanni Direct Leave-in.
I like it because I find that it detangles my hair and I believe it has helped reduce breakage. Also, it does not contain silicone, so it does not build up. However, it does not help actual knots that have formed. Plus, it has to be applied to hair that is soaking wet. On dry hair, it does not penetrate and instead, clumps, beads, and leaves a residue.
Sunsilk (green bottle)
I like it because it softens my hair, smells nice, and leaves my hair light and bouncy (unlike Giovanni, which also smells nice, but weighs my hair down and usually dries hard). I am not sure how moisturizing it is for the long term and it contains various forms of silicone, so it might cause build-up.