Advantage of Dalek over phantom/casper/selenium

[Pratik Shah]

Hi, I work in RoR. We have a huge application and were thinking of writing automated browser test case. I came across Dalek and I loved its simplicity of syntax. But after going more tools like phantom and casper, I am littler confused over which one to use. Can you please explain how Dalek is different from phantom and casper. And under what scenario should I prefer  dalek over phantom/casper