I would actually recommend that you buy / loan the same book from both Pooley AND AFE.
Look at the content, layout, style of writing, format (AFE is more like a textbook whilst Pooleys is more of a book book format). See which one suits you better.
I personally found that the AFE books were very hard to read on the tube / train / bus due to its bigger size, and was not as keen on the style of writing as I was with the Pooleys. But this is entirely down to personal preference.
I haven't heard of the Padpilot and the other one mentioned - so cannot comment, but surely, it's better to give it a try before you set yourself on a particular book set.