In a nutshell, because it's sadly been a while since I've played either of them:
ICON is a rather original system, and its character creation is easier. I did not like much the die system, but that's a matter of personal preference (for me there was too many tests that relied on the drama die to succeed).
CODA shares a lot of similarities with D20 (I see that now that I've played with that system). It's overall much more cinematic (starship combat is the most glaring example), but it lost a few things I liked in ICON (renown types and stun points come to mind).
"The main difference between Trekkies and Manchester United fans is that Trekkies never trashed a train carriage. So why are the Trekkies the social outcasts?"
Terry Pratchett