I've always preferred top mounted cable runs, they stay cleaner and are easier to lube/service. Having the RD cable stop on top of the c-stay gives a neater looking run for the housing too.
Kurt Sperry Bellingham Washington USA.
2008/10/19 <marcus.e.helman@gm.com>:
> Why did framebuilders start running cables under the bottom bracket? It
> seems to offer no advantage. I have one bike with the cables run on top
> of the BB, and one with the cables running underneath. There is no
> difference in shifting that I can tell. Maybe it's just esthetics.
> Personally, I prefer the more traditional top of BB treatment.
>
>
> Wondering,
> Marcus Helman
> Detroit, MI