I think it really depends on your level of experience. The Haynes has pictures and some explanations the the shop manual doesn't. (at least the old Haynes did) That can be a big help to the inexperienced. I use the shop manual and that has all I need in it but you need some mechanical know how to use just that.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!