The clarion has 4 volt outs, cd text, cd-rw playback, and cd-r playback (the rf only has cd-r playback), and a better S/N ratio. Clarion also has zero-bit detect mute which is extremely nice because if the cd player doesn't sense a signal it mutes so that you don't hear any fuzz inbetween tracks (especially helpful on "burnt" cd's).
Not rating the unit on looks, only features. I used to sell both brands at a car audio shop. Both are very reputable brands, so if you have a preference of looks then its all up to your personal taste.