Have you tried re-ripping the CD(s)? I’m pretty sure WMA supports some ID3 tagging. Have you looked at the files and tags in mp3tag or foobar2000? Have you tried updating the tags in those programs then importing after saving the updated tagged file?
AIFF is a lossless format as well, but supports ID3 tags much better than WAV. Not sure why your WMA files tags can’t be read, but I’ve noticed ripping CDs that I rarely get much more than Artist and song title in WMAs that I then convert to AIFF. FLAC, while lossless is compressed. MP3 is not lossless.
I’ll spare you my reasoning, but I chose to go AIFF files due to universal usability, tagging support and having lossless files.
Why so? WMA can be anything from below 128 all the way up to lossless. It depends on what the bit rate is at. If its above 320 and you convert it to 320mp3. No sound difference can be heard.
WMA isn’t restricted to bit rate size like mp3(128 & 320 only).