I'm a fan of Becker. I passed FAR/BEC/AUD with Becker. I took REG with Becker the first time (did not study correctly though – was nearing the end of end of my NTS and listened to lectures for the first and only time in the car while driving from my laptop), and obviously bombed it. Tried the Yaeger/Wiley route next, but felt so scatter-brained by the time the exam came around. Bombed again (somewhat surprised). Settled down, and used 85% Becker and 15% Yaeger for the last round, and finally passed.
I feel that Becker is much more organized than the Wiley book, which really helped me. They also break up the text into more sections than Wiley. The Wiley book is simply overwhelming for me – huge paragraphs in small font on newspaper-type pages (there are very few true headers – everything is separated into Microsoft Word type outlines, with the different levels you know)? Certain keywords are bolded, and I guess those serve as headings). When I want to go look for a particular topic or rule in the Wiley book, I find it near impossible. (I have to usually check the Index, which I don't think I should need to do for a book I spend so much time with). I actually just went through my Wiley book just now to write this response, and I can't imagine trying to learn from this book alone and keep track of all the topics. Becker is in outline format already, so I can walk through each chapter, see the heading and look up from my book and try to recite the rules to myself. There are 2-4 headings on each page pretty much, so it's much easier to manage.
But Yaeger/Wiley has definitely advantages too. Phil Yaeger explains things pretty well, and he walks you through examples on the board. So if you are a visual type learner, then it should be good for you. He also keys in on certain MCQ for you to do for homework, so you have that database of hand-picked questions too. Overall, the Wiley book is more detailed than the Becker book (I found that they share mostly the same rules when explaining something, but Wiley will add a few extra rules or examples for each topic).
I think using both study programs at once was a strong advantage, because there were some topics I didn't feel Becker explained very well or at all (estate, gift taxes) that I read the Wiley book to understand. Also, having two banks of multiple choice was helpful also. But I think these advantages apply to using any two programs concurrently, not just Becker-Wiley specific.
Overall, I learned the best by doing multiple choice questions over and over, highlighting the ones I get wrong, looking up the topic in the text, and doing those 3x more each after I've re-learned the topic. I'm confident that no matter which review program(s) you choose, as long as you put in the time and practice, you will pass.
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