I will suggest Eagle because if you are bothering to make a schematic, maybe it's a good idea to consider that you might want to design a circuit board and manufacture it at some point.
In all honesty, I am not really happy with Eagle's rendition of schematics, but it did pretty well compared to the other free tools I tried a few years ago. If you are sure you want only a schematic figure, then maybe there is a better tool. At least try it and see what you think.