Really, you have to look at what youíre comfortable with and what meets your goals. If youíve had a lot of success with the Snare Toolbox, by all means add the Mallet Toolbox. It correlates so you can teach them to play as a section once they have the basics down. My only disappointment with the materials itself is that I wish they had done a video series with the mallet book as well.
The Wylie book works best for me in settings where the kids are very self-driven and practice regularly. Iíve had trouble getting good results with highly unmotivated groups.