Neither - both would be heavy as fuck and cable operated discs are shit.
Cable operated discs are not shit. The avid and hayes ones are plenty good. Give you much more modulation than a V brake, strong braking when your rims are covered in mud and they also stop your rims from wearing down.
There really isnt enough "purchase/grip" with a normal 700c tyre on roads or paths to require stronger braking than what cable discs offer. If it was a 29er setup or very knobbly cross tyres sunken into sticky mud, the hyrdo's could probably come in handy. Otherwise they are a bit superflous.
Cable operated discs are not shit. The avid and hayes ones are plenty good. Give you much more modulation than a V brake, strong braking when your rims are covered in mud and they also stop your rims from wearing down.
There really isnt enough "purchase/grip" with a normal 700c tyre on roads or paths to require stronger braking than what cable discs offer. If it was a 29er setup or very knobbly cross tyres sunken into sticky mud, the hyrdo's could probably come in handy. Otherwise they are a bit superflous.