FLAC files are large, and Apple Music, many car stereos and older players will not play them. TTA stores audio losslessly in a smaller file than WAV. FLAC is at home in archiving music at full quality; TTA is the usual choice for archiving CDs without losing quality.
The defaults suit most files. Under Options you can trim the start and end.
This pair uses the compatibility engine, ffmpeg built for the browser, because TTA cannot be written by the browser's built-in codecs. It is a one-off download of about 10 MB that the browser keeps, it is slower than the built-in codecs, and it takes files up to 1 GB.