Quote Originally Posted by Nektulos-Tuor View Post
If an effect or item has a huge advantage (over 30%) in a fight against every other item. Then it is no longer a choice, thus it immediately becomes vertical. Even if it started out horizontal. Vertical Progression means there is one best choice, and there are upgrades to that best choice.

Multiple ways of handling the same situation is true horizontal progression.
Got it. >30%: Vertical. <30%: Horizontal.

Thank you for providing your completely arbitrary line.