Depends on your taste. Personally, I hate Eagle and find it really painful to use. KiCAD has rough spots, but I like its workflow a lot more. Plus Eagle's free version restrictions are pretty tight, 80 cm^2 and 2 schematic sheets are quite restrictive even for a hobbyist. I don't begrudge people who use it, but I genuinely prefer KiCAD. And if you're going to pay for a license for your EDA software, I think there are better options as well (OrCAD).
Regarding libraries, in the hobby community Eagle has lost a lot of momentum in the past couple of years. KiCAD is now what you see a lot of makers releasing libraries and stuff for.