At first when I read the title of this thread I felt kind of like ADCMS...or what was my favorite flu bug. But after reading the comments I have to say Commentary on Letter of James tops my list. I think it just may have played a part in my waking up due in part by the reaction of a pioneer sister when I mentioned I was reading it. She basically said it wasn't a good idea...no explanation why. I had no idea at the time who wrote it.
I also liked The Greatest Man book because it focussed on Jesus. Jehovah was not a pleasant god to read about...ever....and at least Jesus had some more positive attributes.
Although I can't say I liked all the songs in the various songbooks that I remember I did like some of them and they were fun to play. There was one song in the old, old green songbook (circa 1950's/60's) that had a song I really liked and was surprised when I found it in my violin lesson book. I actually got into an argument with a girl in my violin class who claimed it was also in her church songbook. My little JW mind just didn't think that possible that bad old christendom had one of 'our' songs and my favorite to boot! It was not in the purple SB that came next😒