There really isn't a difference, as caps for different NOCs under FSW have been removed. And it does seem that CIC offers FSW to everyone who qualifies for both. I am in the same position and was hoping for CEC, but wouldn't have rejected my invitation unless I absolutely had to, so I applied under FSW since that's what was offered. Still waiting, but if people enter the truth in the EE application and find out they're qualified for both programs and invited under one, I have no idea why they would reject their invitation!