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GoatandTricycle
Probably RS 685 because they look acceptable and 'seem' a bit lighter (I haven't checked but they are smaller and more expensive). I wouldn't dream of putting the 505s on my carbon Focus as they would spoil its lines - but then I look forward to braking in the rain on my Bowman on 505s!
You should go and ride both and feel the difference - you might not like the 505s. At least go and have a grip in a shop. Ideally go climb a steep hill and descend on the drops.