The original EDC lasts a shorter amount of time, but IMO is much more pleasant. The citrus is very pure and the drydown (what little there is) is sheer. The Concentree is greener in nature, and lasts longer. However, it seems that whatever Hermes added to increase longevity sort of muddles the quality of the citrus.
The EDC is worth it if you expect and intend to reapply through the day.
Try both, though, because if you end up liking the EDT better anyway...and it has better longevity...you might as well get that.