Choosing a data vendor based upon the UI seems odd. Personally I'd chose whichever provider has the most accurate up to date information, but thats just me.
Yup, if they are basically the same but this is more intuitive and easier why not? As I don't depend on this (otherwise I'd agree) and it's just a "for fun" thing, the differences between them are negligible for me.
The URL has to be publicly accessible from the Internet, right?