One Condition made my hair feel gunky and weighed down. I think Elucence is more conditioning, but it doesn't weigh my hair down badly. I don't like the scent of One Condition, either, reminds me of a bathroom cleaner. I don't have tangling issues, so that doesn't come into play for me.
Type 3a/3b, fine/medium hair, modified CG since 12/2003, Using CHS Curl Keeper, Bioterra gel, Ojon, Elucence