I haven't used CDex recently, so I don't know where it is with its features nowadays. The key thing about EAC though is that its main aim is to rip CDs as accurately as it can. It sacrifices out right speed (some rippers rip a lot faster than EAC, but less accurately).

I don't know what approach CDex takes to ripping quality.
_________________________
Remind me to change my signature to something more interesting someday