CFNA, I've never actually played CFEU but from hat I've hear/seen CFNA seems more active. Yes at the moment CFEU has a better black market but eventually it will turn into CFNA, it's only a matter of time.
"If you're trying to achieve, there will be roadblocks. I've had them; everybody has had them. But obstacles don't have to stop you. If you run into a wall, don't turn around and give up. Figure out how to climb it, go through it, or work around it."
- Michael Jordan