Introduction - If you have any usage issues, please Google them yourself
Overall, Symfony is more sophisticated (ie. harder to use) while CodeIgniter seems more geared to my level of programming and environment. Symfony might be good for you if you live in code day in and day out, and have a dedicated server, but if not, give CodeIgniter a try. I’ll report back after I do some real tests with CodeIgniter to give my honest opinion about how it works.