Now this is just my silly opinion, but unless there's prize money on the line, no way is hydraulic worth the expense. Cable brakes have been around for how many decades? Minimal maintenance, proven reliability, low cost. There's simply no comparison. If you just have money to burn (I never have, probably never will) and you want the latest and greatest tech, or you need that last 0.01 second to beat the next guy, then knock yourself out.
But that's just me.