Whether disc brakes are better or not, depends on what application you plan on using them for. Road bike? Mountain bike?
For mountain bike use and possibly even a commuter bike, yes, disc brakes will be much better. They can provide more power, better control and they can usually be easily modulated. They will almost always be better in rain and wet weather, which I think it one of the main advantages of using disc brakes.
On the other side of the coin, if this is your first time switching to a disc brake setup, then you will have something new to learn in terms of maintenance and brake adjustments. Of course, anything can be learned... Disc brakes will also weigh a bit more than traditional rim brakes.
Personally, I will always go with a bike with discs. Reason being, is that I know they will always work, no matter the conditions. They are reliable and provide the confidence that I need when I am riding a bike, whether on the road or on the trail.