KOIS!! KOIS!! KOIS!!
I have been to Kois and if you are striving to practice at the highest level he will teach you how.
My boss has been through all of Spear and now is going through all of Kois.
He really enjoyed Spear and has great things to say about it. However ,if he had to recommended just one it would be Kois.
Spear is really excellent and tons to learn. I do think however once he sold it to private investors the sales aspect of things went up.
My best friend from Dental School is a Kois mentor and I have several other friends going through it.
One consideration. No matter what your situation you will learn and be better for going to Kois. To get maximum benefit in your practice life it really helps to be an owner or have a lot of freedom to practice how you want. Its frustrating to learn a new technique then your boss won't buy a new material or tool to let you do the job.
Also his approach is comprehensive. From his dental history to full mouth rehab. His forms are really designed to direct you on which path to go down. My friends that went have all implemented them in their office.
Its a big investment but everyone I know that is a practice owner that has went to one of them has finished or is working on finishing them.
I would go to occlusion by itself first or treatment planning/occlusion.
Treatment planning course is a necessary part of it but part of it is a little slow. I could see someone going to just treatment planning by itself and thinking ok this was good but not sure it was as amazing as what kois followers describe. The other courses are utterly fantastic and you will see how the other courses fall into the framework of his treatment planning.