Disc brakes yes!!!! Disc brakes are far more logical and mechanically perfect. The do NOT ruin rims that can be really expensive. An ave cyclist that posts here can change out a disc and pads when they go bad themselves, saving a lot of money. If the rims are ruined most people have to have a LBS sell them a new rim, and rebuild the wheel. That is expensive. Also a rim designed for disc brakes can be any shape that makes it stronger and more aero.

Lastly cyclist on a long ride or cross country cyclist that have a rim break or go bad are on foot. If a disc brake goes bad, the bike still has one good brake. Disc brakes will do for bikes what they did for cars.