We carry a vast range of performance disc brakes but we do actually still stock a few rim brakes for those older bikes that people still love to hack about on.
It is one of the ironies of cycling that the better your brakes are the faster you can ride. Knowing that you have powerful and controllable brakes on hand really helps you have the confidence to tackle challenging and steep terrain and to ride at high speeds that you wouldn't really fancy doing if your brakes were a bit ropey. The majority of mountain bikes these days run hydraulic disc brakes and they are indeed a modern marvel. There's no going back to any rim brakes or cable actuated system once you've experienced proper disc brakes. Whichever system your bike takes, buy the best brakes you can afford. There's no other component on your bike that is as important or influential to your ride experience.