Prototype to production: How to build and design a PCB prototype
If you're starting from scratch now as a hobbyist or novice PCB designer, I'd recommend KiCAD over Eagle. KiCAD is fully open-source and has now progressed to the point where it's viable.Autodesk, on the other hand, has shown signs of crippling Eagle after they bought it, such that I have my doubts about Eagle being viable in 5 years.If you already know Eagle, it's a tougher call, but if you have just begun learning, I think you're better off with KiCAD.