There are some serious problems associated with ripping CD's. The biggest problem is that most CD/DVD drives are not able to accurately report whether an error occurred, and due to strange caching algorithms may produce very strange results.
The
CD/DVD drive you use makes a huge difference. Plextor drivers have long since been recognized as being the best in quality.
The "gold standard" for accurate CD ripping is
Exact Audio Copy, while excellent software, it is Windows-only and closed source.
I'm not aware of an alternative that runs on BSD. One solution might be to rip them twice and compare hashes...