Hi Tom,
As you are a masters in mechanics member, I suggest that you watch all three and get an overview of the concepts and find out if any of them are close to what you are aleady doing. For example, if you find out that you are naturally a downward pickslanter, then you may get quick results from volcano and cascade. In a lot of posts in this forum, @troy has often advised to “get it any way you can”. If downward pickslanting is more natural - go with it. Troy has proven that you can adopt all these mechanics to the point that he can use them a will, but trying to take them all on may be ill advised. Previous to CTC, I worked on alternate picking a lot with limited success. With CTC, I tried to go through it in order Volcano/Cascade/antigravity, but it soon became clear that my previous work had put me closer to the 2-way pickslanting approach and I am now making that my focus. I can do some of the yngwie playing, but I’m going to leave that and cascade until I am proficient in antigravity.
I hope that helped, but maybe some other members will have different opinions to post. Good luck!