OhG, please forgive the assumption, but I reckon you haven't read the "ReadMe" files; there's one contained within and specific to each session (phase).
Read them. Follow the "story". Based on what you learn, you'll be able to make judgements on which sets might be appropriate for your needs. This'll be a whole lot quicker and easier than the alternative to this which would be to read the entire thread.
The other approach might be to "needle-drop" each set - try a few samples from each folder beginning with phase 1 and decide which session/s may be right for you. My suggestion for making this easy:
As you progress through the phases (needle-drop-style), drag the ones you like (something from every phase if you can) to a separate folder (command-drag so you're making copies in order to leave the originals intact). You'll then be able to run through the entire sequence quickly enough to facilitate comparative judgements, which, let's face it, is what you want.
I won't say I hope this helps, 'cause I'm counting on it. I feel your pain. They're sitting in RM waiting for me to get started on this too.