An Anakin who had not just had a troubling encounter with a rival and been forced to confront the dark tendencies in his nature, the dread creeping along the edges of the path he walks, would have chosen his natural inclination of Form V. But this Anakin has been forced to confront these things. It is not often that a person gets an opportunity like the one he—we—have just been afforded. We have a pressure, if we have the strength to take it, to change course.
The goal of this quest is explicitly to not become Vader. To instead be Kol-Depuan, to be the slave who makes free. I think we have two ways to do that. The first is to learn the patience and subtlety of Niman. The second is to learn the committed action of Juyo. Our Path to Juyo is closed for now, but the best way to eventually open it would be to demonstrate balance and grounding in Jedi teachings to Mace Windu through Shii-Cho. Therefore...
[X] Form I - Shii-Cho
[X] Form VI - Niman