Todd,
While a hydraulic clutch is probably more preferable for the street, most old time racers I know prefer mechanical if it was available. Some of us old folk wanting dual duty vehicles, that are mostly drag cars driven on the street, would like to have a mechanical option, which unfortunately is currently unavailable for big block Mopar and possibly for small block Mopar as well.
The reason why I want mechanical is because I believe it's less trouble. I've read all the slave cylinder issues and many of the other headaches others have posted about their hydraulic clutches. I like mechanical because I believe I can diagnose any issues easier. Plus, I already have most of the parts to do it.
Brad