How about used both and like both.
Deva One C- Detangles very well, I love the lemongrass smell, works great when left in

Elucence MBC- don't love the fake peach smell as much as the lemongrass (personal opinion), doesn't detangle quite as well as One C but is GREAT as a leave in.

I think One C detangles better but I think Elucence is a great leave in. Depends on which is most important to you.
2b/3a, primarily use Jessicurl and DevaCurl products, Curls Hair Tea conditioner and various gels. I'm modified CG-ish since 5/04.