Look is not that important than other features. Quality, features etc. are definitely more important than look.
Wimamp is definitely the best MP3 player because:
1. It takes the least system resources compared to other players as WMP.
2. You can change the look from the skins available online.
3. It has many plug-ins which continuously grows in number.
4. And many other reasons.
Winamp is definitely the best MP3 player.