Yes, errors are very dependant in the quality of CD and mostly its condition (if it’s scratched, has fingerprints…).
Any new CDR should be read with no C2 errors, unless the reader is picky/not very good, or the CDR was burned too fast.
Again, all this has nothing to do with jitter correction.
Will there be a big difference if i use CDEX or Audiograbber instead of feurio or eak?
No, quality should be the same unless the CD is in bad condition, like I said.
If the CD is scratched EAC usually works better (depends on reader) than anything if it’s configured properlly.
But CDEX and Audiograbber have no advantage over Feurio. The only advantage is they are faster than EAC.
If you’re newbie it seems a good idea to learn how WAV to CD-Audio transition works, but once you know that, the integration, options, speed, comfort, and quality of Feurio seems a better solution.