Three Codec choices are available: FLAC, MP3 and WAV. I’ve compared a few samples (same songs) between FLAC and WAV and can’t tell any difference in sound quality/fidelity, so I use FLAC since file sizes are reduced around 30-40%. I also rip using MP3 so I can play this in my car. In both formats, I use the default settings.
Now, a question concerning “confidence ”…and here’s an example.
FLAC is a LOSSLESS compression codec so has no loss in quality.
Easy Audio Copy makes use of the AccurateRip database. "Accurately ripped" means the audio matched results stored in that database and the Confidence refers to the number of matches. The term "Confidence" (in my opinion) was a poor choice by the AccurateRip developer. Technically, 200 isn't any better than 2.