I think it depends on the person. I preferred learning on Pooleys and didn't like the AFE books due to their format more than anything else. But some people like it - they're just a little different!
I haven't tried the ePub, but whatever you use to learn - I would recommend using the EASA Exam PPL app (android&iphone) questions at least at the time seemed very similar to the questions in the real exam and did make sure you knew what to expect!