In other words, an informed coin-toss, or which-do-you prefer thread?
They are two very different scents with a brand name in common.
If you like citrus-forward/citrusy scents, L'Essence de Declaration is the lovely way to go.
If you prefer green(er) scents, EdC Concentree will be the better choice.
I have the two and think they are both wonderful for what they were blended to be, and i find them very well adapted to warm temperatures (now BaseNotes is getting me to think seasonally, though i live with year-round heat ).